Applied Thermal Engineering最新文献_第3页

A novel thermal management strategy for building envelopes: Design and performance evaluation of composite walls integrated with phase change radiation unit

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-03-29 DOI: 10.1016/j.applthermaleng.2025.126365

Lifei Ye, Yunfei Ding

{"title":"A novel thermal management strategy for building envelopes: Design and performance evaluation of composite walls integrated with phase change radiation unit","authors":"Lifei Ye, Yunfei Ding","doi":"10.1016/j.applthermaleng.2025.126365","DOIUrl":"10.1016/j.applthermaleng.2025.126365","url":null,"abstract":"<div><div>When phase change material (PCM) are passively integrated into building envelopes, thermal hysteresis and the low thermal conductivity of PCM extend the heat absorption/release cycle, thereby reducing the ability of PCM to regulate the indoor environment under summer external disturbances. This paper proposes a strategy involving the use of phase change materials with enhanced thermal conductivity within radiation cooling panel to form phase change radiation unit. These unit, when combined with conventional building walls, create an active phase change wall (APW), introducing a new thermal management system for building envelopes. First, a sensitivity analysis was conducted to assess the impact and importance of the parameters of composite phase change material (CPCM) on the heat gain of the inner surface. Subsequently, the thermal performance of the APW was systematically studied by varying the transition temperature, transition temperature range, and parameters (latent heat, thermal conductivity and thickness) of CPCM. The results show that incorporating APW enhances the thermal storage and regulation capabilities of the building. Compared to traditional building walls, the thermal storage and adjustment capability (TSAC) value increased by an average of 144.1 %. Sensitivity analysis indicates that the transition temperature of PCM is the primary factor affecting heat gain, followed by parameters such as thickness, latent heat, and density, while the effect of specific heat capacity on heat gain is negligible. Additionally, an increase in latent heat and thickness significantly affect thermal performance, but their increases should not exceed a certain threshold. It is recommended that the thermal conductivity should be between 1–3 W/(m·K), the transition temperature be 26 °C, and the transition temperature range be 4 K.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"271 ","pages":"Article 126365"},"PeriodicalIF":6.1,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental investigation on the influence of drainage structure on vortex tube energy separation

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-03-29 DOI: 10.1016/j.applthermaleng.2025.126363

Fachun Liang , Jiaao Chen , Guoxiang Tang

{"title":"Experimental investigation on the influence of drainage structure on vortex tube energy separation","authors":"Fachun Liang , Jiaao Chen , Guoxiang Tang","doi":"10.1016/j.applthermaleng.2025.126363","DOIUrl":"10.1016/j.applthermaleng.2025.126363","url":null,"abstract":"<div><div>The vortex tube is widely used in cooling or heating applications and can also serve as an effective tool for condensing and removing water vapor from natural gas. Experiments were conducted on a counterflow vortex tube equipped with a drainage structure to investigate the underlying energy separation mechanism. This experimental vortex tube features six inlet nozzles and a cold cone with a 2° taper angle. Unlike conventional vortex tubes, the hot end of this design incorporates a drainage channel to expel the separated liquid phase. The inlet pressure varied from 0.1 to 0.4 MPa, and the cold mass fraction ranged from 0.16 to 0.87. Both straight and inclined drainage channels were evaluated and compared. Furthermore, the effect of liquid drainage positions on energy separation performance was examined. The results indicate that under operating conditions of an inlet pressure of 0.4 MPa and a cold mass fraction of 0.38, the maximum temperature drop at the cold end of the vortex tube with an inclined slot drainage structure reached 25 °C, demonstrating superior energy separation performance compared to the straight slot drainage design. This finding suggests that optimizing the drainage structure and position can significantly enhance the energy separation efficiency of the vortex tube. Furthermore, when the drainage structure adopts an inclined groove design and is positioned in the center, the use of the vortex tube for condensing and removing moist air can achieve a maximum removal rate of 77 %, showcasing its tremendous potential in gas treatment applications.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"271 ","pages":"Article 126363"},"PeriodicalIF":6.1,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessment of piston and injector cap designs on the performance of a hydrogen direct-injection spark-ignition engine

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-03-29 DOI: 10.1016/j.applthermaleng.2025.126372

Xinlei Liu , Rafael Menaca , Balaji Mohan , Mickael Silva , Abdullah S. AlRamadan , Emre Cenker , Le Zhao , Rafael Lago Sari , Yuanjiang Pei , Hong G. Im

{"title":"Assessment of piston and injector cap designs on the performance of a hydrogen direct-injection spark-ignition engine","authors":"Xinlei Liu , Rafael Menaca , Balaji Mohan , Mickael Silva , Abdullah S. AlRamadan , Emre Cenker , Le Zhao , Rafael Lago Sari , Yuanjiang Pei , Hong G. Im","doi":"10.1016/j.applthermaleng.2025.126372","DOIUrl":"10.1016/j.applthermaleng.2025.126372","url":null,"abstract":"<div><div>Hydrogen is considered a critical solution in the transition to sustainable energy systems. This study provides the first comprehensive evaluation of the combined effects of piston geometry and injector cap design on the performance of a heavy-duty hydrogen direct-injection spark ignition engine using high-fidelity computational fluid dynamics simulations. Four piston geometries: ω-shaped, flat, pent-roof, and a hybrid of flat and pent-roof, were evaluated. Moreover, the hydrogen injector design was analysed by varying the number of cap holes (4-, 5-, and 6-hole) and the jet-included angle (±10˚), alongside two cap orientations (X and + ). The study found that different piston geometries significantly influenced hydrogen jet interaction with the piston wall and overall mixing. The flat piston produced a more homogeneous mixture before ignition, contributing to lower NO<sub>x</sub> emissions. Conversely, the bowl-shaped piston resulted in a strongly stratified mixture distribution and faster combustion, yielding the highest thermal efficiency while increasing NO<sub>x</sub> emissions. Although the + cap orientation was intended to guide the mixture toward the spark plug, it could not ensure a richer mixture at the spark plug. The 5-hole cap promoted a more uniform mixture and reduced NO<sub>x</sub> emissions. Furthermore, adjusting the jet-included angle by 10° led to more stratified mixing, leading to a slower combustion process and negatively impacting engine performance. Considering the best compromise between NO<sub>x</sub> emissions and fuel economy, the ω-shaped piston combined with a 5- or 6-hole cap injector exhibited superior performance over the 4-hole configuration, primarily in favor of the significantly reduced NO<sub>x</sub> emissions.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"271 ","pages":"Article 126372"},"PeriodicalIF":6.1,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental investigation of the inhibition effects of metal foam on condensation-induced water hammer in the offshore-based passive heat removal system

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-03-29 DOI: 10.1016/j.applthermaleng.2025.126373

Zhiwei Wang , Zhongdi Duan , Hongxiang Xue , Yanping He

{"title":"Experimental investigation of the inhibition effects of metal foam on condensation-induced water hammer in the offshore-based passive heat removal system","authors":"Zhiwei Wang , Zhongdi Duan , Hongxiang Xue , Yanping He","doi":"10.1016/j.applthermaleng.2025.126373","DOIUrl":"10.1016/j.applthermaleng.2025.126373","url":null,"abstract":"<div><div>The offshore-based passive heat removal system (OBPHRS) for floating nuclear power platforms (FNPP) uses the marine environment as an infinite heat sink. However, the reverse flow of the cold sea can easily trigger the condensation-induced water hammer (CIWH) phenomenon, which can cause significant damage to the pipeline equipment and affect the system’s safety operation. In this paper, an experiment study was conducted to investigate the inhibition effects of metal foam on the CIWH phenomenon in the OBPHRS. The visual images show that the metal foam reduces the volume of isolated steam slugs and concentrates the capture positions near the water tank. Additionally, the metal foam diminishes the reverse flow effects of the cold water, leading to a significant decrease in temperature fluctuations during natural circulation. As a result of the reverse flow effects weakening, the CIWH phenomena in the pipe section near the pipe inlet are eliminated. The pressure peaks at the measuring points covered with the metal foam show a clear decrease in intensity. Furthermore, as the metal foam pore density increases, the pressure peak relief effects become more pronounced. The metal foam improves the flow rate of natural circulation, enhancing the residual heat removal capacity of the OBPHRS.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"271 ","pages":"Article 126373"},"PeriodicalIF":6.1,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental validation of numerical heat transfer models of an impingement jet at high Reynolds numbers

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-03-28 DOI: 10.1016/j.applthermaleng.2025.126350

Eileen Trampe, Dominik Büschgens, Herbert Pfeifer, Christian Wuppermann

{"title":"Experimental validation of numerical heat transfer models of an impingement jet at high Reynolds numbers","authors":"Eileen Trampe, Dominik Büschgens, Herbert Pfeifer, Christian Wuppermann","doi":"10.1016/j.applthermaleng.2025.126350","DOIUrl":"10.1016/j.applthermaleng.2025.126350","url":null,"abstract":"<div><div>In industrial thermal processing plants, metal strips are quenched in cooling zones by impingement jets, with convection being the dominant heat transfer mechanism. To generate the impingement jets, gas is accelerated through a nozzle system and directed onto the material surface, resulting in rapid and uniform cooling. The present work involves the experimental investigation of the heat transfer and associated flow of impingement jets using PIV on a single slot (<em>W</em> = 5mm) and a single round nozzle (<em>D</em> = 25mm). These experimental methods form the basis for the evaluation of numerical turbulence models. The turbulence models selected in this work are: SSTmodel, Generalised <em>k-ω</em> (GEKO)model and the Reynolds Stress Model. The investigations are carried out at a nozzle exit velocity of <em>u</em>   <!-->m/s (<em>Re<sub>Slot</sub></em> = 34,490, <em>Re<sub>Round</sub></em> = 88.780). Compared to other studies with a Reynolds number of below 23,000, the prediction accuracy is less due to the high Reynolds number. The PIV measurement shows that the flow velocities are correctly modelled, but the turbulent kinetic energy can only be poorly predicted.<sup>[email protected]</sup></div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"271 ","pages":"Article 126350"},"PeriodicalIF":6.1,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of heating strategies and ballistic transport on the thermal conduction in fin field-effect transistors

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-03-28 DOI: 10.1016/j.applthermaleng.2025.126293

Chuang Zhang , Ziyang Xin , Qin Lou , Hong Liang

{"title":"Effects of heating strategies and ballistic transport on the thermal conduction in fin field-effect transistors","authors":"Chuang Zhang , Ziyang Xin , Qin Lou , Hong Liang","doi":"10.1016/j.applthermaleng.2025.126293","DOIUrl":"10.1016/j.applthermaleng.2025.126293","url":null,"abstract":"<div><div>Efficiently predicting three-dimensional temperature distributions and understanding the non-Fourier thermal conduction mechanism are of great significance for alleviating hotspot issue in fin field-effect transistors (FinFETs). Numerical solutions of the effective Fourier’s law (EFL) and the phonon Boltzmann transport equation (BTE) are two mainstream thermal engineering simulation methods in FinFETs, but continuous heating and steady-state temperature distributions are mainly considered in the previous work. Until today, effects of discontinuous heating on micro/nano scale thermal conduction is rarely studied, and the deviations between the predictions of the EFL and the phonon BTE in FinFETs are rarely compared, either. To answer these questions, three different heating strategies are considered including ‘Continuous’, ‘Intermittent’ and ‘Alternating’ heating, and the heat conduction processes in FinFETs are simulated by both the phonon BTE and EFL. Numerical results show that different heating strategies have great influence on the peak temperature rise and transient thermal dissipation process. Compared to ‘Intermittent’ or ‘Continuous’ heating, the temperature variance of ‘Alternating’ heating is smaller. The peak temperature rise of ‘Alternating’ heating is <span><math><mrow><mn>28</mn><mtext>%</mtext><mo>−</mo><mn>43</mn><mo>.</mo><mn>5</mn><mtext>%</mtext></mrow></math></span> lower than that of ‘Continuous’ heating in FinFETs. The silicon dioxide insulation layer reduces the thermal shock on the bottom substrate material although it raised the overall temperature in the fin area. It is not easy to accurately capture the heat conduction in FinFETs by the EFL, especially near the nanoscale hotspot and corner areas where ballistic phonon transport dominates and the temperature diffusion is no longer valid.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"271 ","pages":"Article 126293"},"PeriodicalIF":6.1,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Transient model and performance evaluation of a polygonal automobile exhaust thermoelectric generator under different driving cycles

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-03-28 DOI: 10.1016/j.applthermaleng.2025.126348

Rui Quan, Xuerong Li, Yulong Zhou, Hang Wan, Yufang Chang

{"title":"Transient model and performance evaluation of a polygonal automobile exhaust thermoelectric generator under different driving cycles","authors":"Rui Quan, Xuerong Li, Yulong Zhou, Hang Wan, Yufang Chang","doi":"10.1016/j.applthermaleng.2025.126348","DOIUrl":"10.1016/j.applthermaleng.2025.126348","url":null,"abstract":"<div><div>Considering the steady-state model is difficult to accurately evaluate the transient performance of the automobile exhaust thermoelectric generator (AETEG) system under practical conditions, an octagonal AETEG system embedded with sickle-shaped fins was designed in this work, and a transient computational fluid dynamics (CFD) model was established to precisely assess the dynamic fluid-thermal coupling characteristic under four driving cycles of China Light-duty Vehicle Test Cycle (CLTC), Highway Fuel Economy Test (HWFET), New European Driving Cycle (NEDC) and Urban Dynamometer Driving Schedule (UDDS). Moreover, the dynamic voltage, power, and conversion efficiency were numerically calculated with a theoretical analytical model based on the transient fluid and thermal distribution. Results indicate that the predicted voltage and power errors between simulation data and experimental results are 4.25 % and 4.73 %, respectively, verifying the feasibility of the constructed transient numerical model. Additionally, both the transient output voltage and power are proportional to exhaust temperature, and the hysteresis effect in the heat transfer affects AETEG’s output performance smoothness and leads to its peak conversion efficiency when the heat absorption plummets. The AETEG system has the best average transient output performance under the HEFET driving cycle due to the continuous high-temperature exhaust flow, and the average transient power and conversion efficiency approach 81.11 W and 2.1 %, respectively. Under the CLTC driving cycle, the AETEG system reaches the best maximum voltage, power, and conversion efficiency of 170.02 V, 144.54 W, and 7.47 %, respectively. This study provides theoretical guidance for transient performance analysis and optimization of AETEG systems during in-vehicle applications.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"271 ","pages":"Article 126348"},"PeriodicalIF":6.1,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Joint optimization of leg configuration and fin structure in a two-stage segmented thermoelectric generator for enhanced 3E performance

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-03-28 DOI: 10.1016/j.applthermaleng.2025.126354

Wenlong Yang , Chenchen Jin , Wenchao Zhu , Peipei Meng , Wei Lin , Hao Li , Changjun Xie

{"title":"Joint optimization of leg configuration and fin structure in a two-stage segmented thermoelectric generator for enhanced 3E performance","authors":"Wenlong Yang , Chenchen Jin , Wenchao Zhu , Peipei Meng , Wei Lin , Hao Li , Changjun Xie","doi":"10.1016/j.applthermaleng.2025.126354","DOIUrl":"10.1016/j.applthermaleng.2025.126354","url":null,"abstract":"<div><div>Existing research typically optimizes either the thermoelectric leg configuration or the fin structure independently, often neglecting the potential interactions between the two. This study proposes a novel two-stage segmented thermoelectric generator, examining the interplay between thermoelectric legs and fin structure and their impact on energy, exergy, and economic (3E) performance. Using the Taguchi method and Grey Relational Analysis, a joint optimization of thermoelectric legs and fin structure was conducted. The results reveal a significant interaction effect between the leg structure and fin thickness. The optimal leg structure is contingent on the fin thickness, and vice versa. When the area ratio between the upper and lower leg sections is 0.5, the optimal fin thickness is 1 mm; when the area ratio increases to 1, the optimal fin thickness decreases to 0.5 mm. However, the optimal fin spacing is not influenced by the leg structure. The optimized two-stage segmented thermoelectric generator exhibits superior 3E performance, with net power, exergy efficiency, and levelized energy cost reaching 19.36 W, 12.14 %, and 25.5 W/$, respectively. These values represent improvements of 32.3 %, 34.4 %, and 100.7 % over conventional two-stage thermoelectric generators. This study provides crucial design guidance for the joint optimization of fin and thermoelectric semiconductor structures.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"271 ","pages":"Article 126354"},"PeriodicalIF":6.1,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel method of in-situ temperature distribution measurement of solid oxide fuel cell stack

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-03-28 DOI: 10.1016/j.applthermaleng.2025.126355

Xingyu Xiong , Bintao Zheng , Yunfei Wu , Liang Hu , Xin Wu , Suping Peng

{"title":"A novel method of in-situ temperature distribution measurement of solid oxide fuel cell stack","authors":"Xingyu Xiong , Bintao Zheng , Yunfei Wu , Liang Hu , Xin Wu , Suping Peng","doi":"10.1016/j.applthermaleng.2025.126355","DOIUrl":"10.1016/j.applthermaleng.2025.126355","url":null,"abstract":"<div><div>A novel method for measuring the in-situ temperature of the Solid Oxide Fuel Cell (SOFC) stack is developed. Multiple optical silica fibers with a 0.4 mm diameter were integrated into a 3 × 3 array which was plugged into a 1 kW stack. The in-situ temperature of the stack with different loads in steady-states and dynamics operating conditions was tested within a furnace heated up to 750 °C. By moving the fiber array using a three-axis manipulator, the temperature distributions along the cathode flow channels were scanned and the measurement resolution was set to 1 mm. For the current load with 10 A, 20 A and 30 A in a steady-state, the experimental results show a clear trend of higher temperature on outlet and top of the stack in steady-state. The maximum temperature differences inside the stack were more than 44 °C for 30 A. During the processes of the start-up, current linearly increased from 0A to 10 A, 20 A and 30 A individually with a fixed slope of 2.5 A/min and the current was maintained for 20 min, the maximum temperature of the stack raised to 766 °C, 783 °C and 805 °C, respectively. Moreover, the dynamic responses of the temperature with fluctuating inputs such as a rapid step loading and unloading test from 0 A to 30 A and 30 A to 0 A in 4 min recorded that the temperature change rate inside the stack was within 1 °C/min, which shows a capability of quickly power adjusting of SOFC.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"271 ","pages":"Article 126355"},"PeriodicalIF":6.1,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental and numerical study on the thermal and hydraulic characteristics of an improved PCHE with high-viscosity fluid

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-03-28 DOI: 10.1016/j.applthermaleng.2025.126345

Jie Wen , Huifang Ma , Guoqiang Xu , Bensi Dong , Zhiwei Liu , Laihe Zhuang

{"title":"Experimental and numerical study on the thermal and hydraulic characteristics of an improved PCHE with high-viscosity fluid","authors":"Jie Wen , Huifang Ma , Guoqiang Xu , Bensi Dong , Zhiwei Liu , Laihe Zhuang","doi":"10.1016/j.applthermaleng.2025.126345","DOIUrl":"10.1016/j.applthermaleng.2025.126345","url":null,"abstract":"<div><div>The increasing heat load in the lubricating oil system imposes higher requirements on the heat dissipation capacity of the fuel–oil heat exchanger. A Printed Circuit Heat Exchanger (PCHE) has emerged as a promising candidate to substitute for the traditional shell-tube heat exchanger due to its exceptional thermal efficiency and compact design. In this study, a new PCHE configuration is designed which staggered discontinuous fins with modified airfoil fins and cylindrical spoiler columns located at the inlet and outlet to avoid the high-velocity and negative pressure gradient areas while improving strength and flow field uniformity. Experimental results show that the thermal–hydraulic performance on the oil side is significantly influenced by the inlet temperature because the viscosity varies more sharply with temperature at the same Reynolds number, unlike the fuel side. Further numerical investigations reveal larger regions of high heat flux, high temperature, and high velocity on the oil side at lower inlet temperatures, which lead to increased heat conduction and more effective heat transfer in laminar flow. Additionally, the correlations for the Nusselt number (<em>Nu</em>) and the friction coefficient of fuel and oil in modified airfoil fins PCHE have been developed. Under the laminar flow, the modified airfoil fins PCHE exhibits superior heat transfer, with the <em>Nu</em> being 1.70 times higher than that of airfoil fins (<em>S</em><sub>1</sub> = 6.0 mm), 2.10 times higher than that of zigzag channels, 2.83 times higher than that of airfoil fins (<em>S</em><sub>1</sub> = 2.4 mm), and 4.70 times higher than that of straight channels at <em>Re</em> = 396.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"271 ","pages":"Article 126345"},"PeriodicalIF":6.1,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0