Applied Thermal Engineering最新文献_第3页

Interaction between porous media and detonation wave on transpiration cooling for rotating detonation engine 多孔介质与爆震波的相互作用对旋转爆震发动机蒸腾冷却的影响

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-12 DOI: 10.1016/j.applthermaleng.2025.126811

Shun Lu, Qingyong Zhu, Hao Chen, Liangzhong Fan, Jishuang Gong

{"title":"Interaction between porous media and detonation wave on transpiration cooling for rotating detonation engine","authors":"Shun Lu, Qingyong Zhu, Hao Chen, Liangzhong Fan, Jishuang Gong","doi":"10.1016/j.applthermaleng.2025.126811","DOIUrl":"10.1016/j.applthermaleng.2025.126811","url":null,"abstract":"<div><div>Transpiration cooling in a rotating detonation engine (RDE) is a typical heat and mass transfer problem involving the interaction between porous media and the detonation wave. This phenomenon exhibits temporal and spatial instability. This study employs numerical simulation methods, using water and kerosene as coolants, and a 10-step reaction model to simulate the interaction between porous media and detonation wave. It investigates the transpiration cooling effects of various porous media structures within the RDE combustion chamber. The aim is to explore the relationship between the propagating detonation wave and the transpiration cooling, and to analyze the heat and mass transfer processes, as well as the thermal protection effects. The results reveal that when the porous medium is placed too close to detonation wave, the wave’s structure is disrupted and eventually dissipates, which makes it difficult to inject coolant. Increasing the width of the porous medium improves the cooling effect, extends the effective cooling distance, and enlarges the effective coverage of the coolant. As the detonation wave propagates, the dominance alternates periodically between the combustion gases and the coolant, inducing distinct vortices within the porous medium. These findings offer valuable insights for the study of unsteady transpiration cooling and practical applications of the RDE.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126811"},"PeriodicalIF":6.1,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144071426","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

Double-pass solar air heater with staggered vertical phase change material cylinders: Thermal performance evaluation 交错垂直相变材料圆柱体双通式太阳能空气加热器：热性能评价

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-12 DOI: 10.1016/j.applthermaleng.2025.126762

Sahibzada Imad Ud Din , Adnan Ibrahim , Ahmad Fazlizan , Norasikin Ahmad Ludin , Muhammad Aqil Afham Rahmat , Haris Ali , Amel Djebara , Zouheyr Noui

{"title":"Double-pass solar air heater with staggered vertical phase change material cylinders: Thermal performance evaluation","authors":"Sahibzada Imad Ud Din , Adnan Ibrahim , Ahmad Fazlizan , Norasikin Ahmad Ludin , Muhammad Aqil Afham Rahmat , Haris Ali , Amel Djebara , Zouheyr Noui","doi":"10.1016/j.applthermaleng.2025.126762","DOIUrl":"10.1016/j.applthermaleng.2025.126762","url":null,"abstract":"<div><div>Low thermal efficiency and inconsistent temperature distribution remain key obstacles in current solar air heater designs. To address this problem, this study proposes a novel double-pass solar air heater featuring a sandwich structure with vertical phase change material cylinders arranged in a staggered layout within the second channel. A combined numerical and indoor experimental approach was employed to study the thermal performance under varying mass flow rates of 0.01–––0.05 kg/s and solar irradiances of 400–1000 W/m<sup>2</sup>. The numerical simulations provided detailed insights into temperature distribution and velocity contours<strong>,</strong> highlighting the impact of cylinder configuration on flow dynamics and heat transfer behaviour within the system. For experimental results, the system achieved a maximum thermal efficiency of 90.97 %, with a temperature rise of 25.9 °C at a mass flow rate of 0.05 kg/s and 0.01 kg/s, respectively, under a solar irradiance of 1000 W/m<sup>2</sup>. For optimum performance, a mass flow rate of 0.01–0.03 kg/s is suitable for practical applications like solar drying and space heating. Relative errors varied in the range of 1.60 % and 3.26 % for thermal efficiency between numerical and experimental results, which portrays a good agreement. The findings suggest that this storage design is a promising solution for enhancing energy efficiency and thermal stability in solar air heater applications.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126762"},"PeriodicalIF":6.1,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143942015","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

Electrical and thermal analysis of a newly designed photovoltaic thermal collector featuring inner and outer micro-fin surface tube with broken double V-cuts twisted tapes: An experimental study 新设计的内外微翅片表面管双v形扭带破碎光伏集热器的电学和热分析：实验研究

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-12 DOI: 10.1016/j.applthermaleng.2025.126757

Mahmoud Jaber, Adnan Ibrahim, Hariam Luqman Azeez, Banw Omer Ahmed, Sahibzada Imad Ud Din, Hasila Jarimi

{"title":"Electrical and thermal analysis of a newly designed photovoltaic thermal collector featuring inner and outer micro-fin surface tube with broken double V-cuts twisted tapes: An experimental study","authors":"Mahmoud Jaber, Adnan Ibrahim, Hariam Luqman Azeez, Banw Omer Ahmed, Sahibzada Imad Ud Din, Hasila Jarimi","doi":"10.1016/j.applthermaleng.2025.126757","DOIUrl":"10.1016/j.applthermaleng.2025.126757","url":null,"abstract":"<div><div>Photovoltaic systems encounter significant challenges related to the decline in efficiency due to the high surface temperature. To mitigate these issues, Photovoltaic thermal systems are developed to face the drawbacks of temperature and enhance the overall efficiency. This study examines the overall efficiency of the newly designed PV/T. The new absorber tube featured an inner and outer micro-fin surface absorber tube with broken double V-cuts twisted tapes. This study uses an indoor solar simulator under six different coolants, namely water, 0.4 % CuO, 0.8 % CuO, and the same coolants with 1 % CuO nano-phase change material, to assess the performance of the newly designed collector. The experiment’s test conditions, including irradiances of (400, 550, 700, 850, and 1000) W/m<sup>2</sup>, and flow rates of (0.01, 0.02, 0.03, 0.04, and 0.05) kg/s. The results indicated a proportional relationship between mass flow rates and electrical and thermal performance. The highest electrical and thermal efficiencies were obtained using 0.8 % CuO with nano-phase change material with 12.01 % and 83.61 %, respectively, at an irradiance of 850 W/m<sup>2</sup> and a flow rate of 0.05 kg/s. Under the same conditions, the maximum power production achieved was 26.01 W.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126757"},"PeriodicalIF":6.1,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143947325","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 modeling of an ambient-temperature-source centrifugal-compressor steam-generating heat pump 常温源离心-压缩机制汽热泵的瞬态建模

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-12 DOI: 10.1016/j.applthermaleng.2025.126812

Kelly P. Ryan , Adewale Odukomaiya , Meha Setiya , Nickolas R. Roberts , Jeffrey Milkie , Joe Huyett , Todd M. Bandhauer

{"title":"Transient modeling of an ambient-temperature-source centrifugal-compressor steam-generating heat pump","authors":"Kelly P. Ryan , Adewale Odukomaiya , Meha Setiya , Nickolas R. Roberts , Jeffrey Milkie , Joe Huyett , Todd M. Bandhauer","doi":"10.1016/j.applthermaleng.2025.126812","DOIUrl":"10.1016/j.applthermaleng.2025.126812","url":null,"abstract":"<div><div>As the US electricity grid transitions to renewable power generation, electrifying end-uses that are currently fossil fuel fired presents a promising path towards decarbonization, and next generation high-temperature heat pumps are a viable solution for decarbonizing boilers. These next-gen systems require higher design complexity and more finely tuned control strategies than existing systems and therefore can benefit from transient modeling that has not been previously implemented for these types of systems. A transient study of a high temperature steam-generating heat pump with steam delivery temperature of 150 °C was conducted using physics-based simulation software. The model was set up to match the configuration of a prototype system constructed at Colorado State University. The transient model results agreed well with the steady state model of the heat pump at the design point. Transient conditions including cold startup to full load operation, full load operation to part load operation, and part load operation back to full load operation were modeled. Compressor and expansion valve performance and COP were investigated. Compressors were found to operate within their performance maps for both steady and transient operation. A control strategy was developed for the expansion valves to prevent liquid ingestion when transitioning to turndown operation.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126812"},"PeriodicalIF":6.1,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144071513","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 study on the phase transition evolution and dynamic characteristics of high-pressure CO2 pipeline leakage 高压CO2管道泄漏相变演化及动态特性实验研究

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-12 DOI: 10.1016/j.applthermaleng.2025.126805

Xuhai Pan , Chenyan Wang , Xilin Wang , Zhongjun Yan , Min Hua , Juncheng Jiang

{"title":"Experimental study on the phase transition evolution and dynamic characteristics of high-pressure CO2 pipeline leakage","authors":"Xuhai Pan , Chenyan Wang , Xilin Wang , Zhongjun Yan , Min Hua , Juncheng Jiang","doi":"10.1016/j.applthermaleng.2025.126805","DOIUrl":"10.1016/j.applthermaleng.2025.126805","url":null,"abstract":"<div><div>Brittle fracture of pipelines is one of the common consequences of high-pressure CO<sub>2</sub> leakage accidents. Understanding the phase transition mechanism and flashing flow characteristics during high-pressure liquefied CO<sub>2</sub> leakage is crucial for the safety of pipeline systems. In this study, a high-pressure liquefied CO<sub>2</sub> horizontal visualization pipeline was established to investigate pressure responses, temperature variation patterns, and temperature reduction characteristics along the pipeline during flashing flow. The phase transition evolution was recorded using a high-speed camera. Results show that the phase transition process can be divided into six stages. Pressure and temperature responses are more sensitive to the initial temperature: an increase in the initial temperature slows down the depressurization at a higher pressure level, but results in a smaller temperature reduction. A temperature gradient forms along the flow direction, with greater and faster temperature reductions near the release orifice (lowest temperature: 50.85∼54.82 °C) and smaller drops further away (24.87∼30.39 °C). Moreover, higher initial temperatures cause greater fluctuations in average temperature reduction rates under the same pressure change. At 16 °C, the rate was 0.93∼0.96 °C/s for 8∼11 MPa, while at 27 °C, it increased to 1.12∼1.25 °C/s, indicating that operating at lower temperatures can effectively expand the safety margin for pressure regulation.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126805"},"PeriodicalIF":6.1,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936995","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

Numerical investigation on the unsteady flow and heat transfer characteristics of supercritical carbon dioxide within a vertical tube under offshore conditions 近海条件下垂直管内超临界二氧化碳的非定常流动及换热特性数值研究

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-12 DOI: 10.1016/j.applthermaleng.2025.126796

Hansi Song, Yongqi Yan, Feng Zhang, Gaoliang Liao, Jiaqiang E.

{"title":"Numerical investigation on the unsteady flow and heat transfer characteristics of supercritical carbon dioxide within a vertical tube under offshore conditions","authors":"Hansi Song, Yongqi Yan, Feng Zhang, Gaoliang Liao, Jiaqiang E.","doi":"10.1016/j.applthermaleng.2025.126796","DOIUrl":"10.1016/j.applthermaleng.2025.126796","url":null,"abstract":"<div><div>The S-CO<sub>2</sub> Brayton cycle is regarded as one of the most promising energy conversion technology for ship power and other floating power plants due to its high efficiency, light weight and compact structure. Being different from land-based systems, movements of floating platforms at sea are complicated, which not only change the device position but also induces additional inertial forces. Extensive research has been conducted on the thermal–hydraulic characteristics of supercritical carbon dioxide (S-CO<sub>2</sub>) under land-based steady-state conditions. However, despite the promising application prospects of S-CO<sub>2</sub> power cycles in marine vessels and floating platforms, investigations into the flow and heat transfer behavior of S-CO<sub>2</sub> under ocean motion conditions remain notably scarce. Therefore, a systematically comparative study on the unsteady flow and heat transfer characteristics of S-CO<sub>2</sub> under steady state and offshore conditions is conducted. The results indicated that under the rolling motion, the periodically changing inertial forces parallel to axial direction contribute to weakening the buoyance effect, and the periodically changing inertial forces perpendicular to axial direction induce the secondary flow which intensifies the mixing between the mainstream and near-wall fluid. These contribute to alleviating and even avoiding the heat transfer deterioration, causing a better heat transfer performance of S-CO<sub>2</sub>. Moreover, the variation in aerodynamic and thermal parameters of S-CO<sub>2</sub> has no effect on the rolling motion-induced periodically changing accelerations, but it changes the density magnitude and distribution of S-CO<sub>2</sub>, and thus the inertia force effect on the flow structure varies, causing different heat transfer and resistance characteristics of S-CO<sub>2</sub>.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126796"},"PeriodicalIF":6.1,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143941980","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 hybrid battery thermal management integrating phase change material and micro-channel liquid cooling 一种结合相变材料和微通道液体冷却的新型混合电池热管理方法

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-12 DOI: 10.1016/j.applthermaleng.2025.126721

Jiawei Xiao , Haitao Min , Hongxia Jiang , Zhaopu Zhang , Weiyi Sun , Qiming Cao

{"title":"A novel hybrid battery thermal management integrating phase change material and micro-channel liquid cooling","authors":"Jiawei Xiao , Haitao Min , Hongxia Jiang , Zhaopu Zhang , Weiyi Sun , Qiming Cao","doi":"10.1016/j.applthermaleng.2025.126721","DOIUrl":"10.1016/j.applthermaleng.2025.126721","url":null,"abstract":"<div><div>Battery thermal management system (BTMS) are essential for maintaining battery performance and safety in electric vehicles (EVs). This paper presents a novel hybrid BTMS (HBTMS) designed to improve performance subject to both cooling and heating requirements. The proposed system integrates micro-channel liquid cooling and phase change materials (PCM) used in a novel sandwich hybrid cooling plate (SHCP) design. This study thoroughly evaluates the performance of this design under various operating conditions. The results demonstrate that the proposed design reduces the maximum temperature by 3.86 K and 4.68 K compared with that of the conventional design. In addition, the temperature uniformity of the battery was improved at both the single-cell and module levels. Furthermore, the proposed design avoids introducing additional heating burden and delays the cooling process during low-temperature rest conditions, with the battery temperature increasing by 6.1 K and 11.4 K after 1 h of rest. Specifically, under cycling conditions, the proposed design increased the PCM melting fraction by 0.03–0.04 and enabled rapid latent heat release, while reducing the high-load operation time of the liquid cooling system by 61 % and 67 %, and decreasing the pumping energy consumption by 51–53 %. Finally, the proposed design delays battery thermal abuse under BTMS failure conditions. Overall, the proposed design simultaneously optimizes the cooling and heating functions, providing enhanced thermal performance, improved energy efficiency, and increased safety for EVs battery applications.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126721"},"PeriodicalIF":6.1,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144071516","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

Demand response in buildings: Comparative study on energy flexibility potential of underfloor heating and air conditioning systems 建筑需求响应：地暖与空调系统能源灵活性潜力的比较研究

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-12 DOI: 10.1016/j.applthermaleng.2025.126801

Qingrong Liu , Yongchun Liu , Fanyue Qian , Tingting Xu , Hua Meng , Yuting Yao , Yingjun Ruan

{"title":"Demand response in buildings: Comparative study on energy flexibility potential of underfloor heating and air conditioning systems","authors":"Qingrong Liu , Yongchun Liu , Fanyue Qian , Tingting Xu , Hua Meng , Yuting Yao , Yingjun Ruan","doi":"10.1016/j.applthermaleng.2025.126801","DOIUrl":"10.1016/j.applthermaleng.2025.126801","url":null,"abstract":"<div><div>Buildings consume significant energy, and their flexibility can be effectively harnessed through demand response (DR) programs to support grid stability. Underfloor heating and air conditioning systems are widely used in residential buildings but exhibit different thermal behaviors due to their distinct heat transfer mechanisms. However, there is a lack of systematic, quantitative comparison of their energy flexibility characteristics. This study combines real-world measurements and EnergyPlus simulations to evaluate the thermal response time and energy charging/discharging performance of both systems. Results show that under high-temperature conditions, compared to air conditioning, underfloor heating takes 100 %–300 % longer to raise the temperature by 1 °C, and 150 %–350 % longer to lower it. Over a 24-hour cycle with 12 preheating/discharging operations, the underfloor heating system releases 612 %-762 % more energy per square meter than air conditioning. In highly insulated buildings preheated for 1 h at 22 °C, the load reduction of underfloor heating exceeds that of air conditioning by 0.44–0.85. These findings reveal that underfloor heating offers superior load-shifting potential and energy flexibility. By fully utilizing its thermal storage capacity, enhancing building insulation, and optimizing preheating strategies, stored energy can be more effectively used during high-demand periods. The results provide a quantitative foundation for the selection and control of heating systems in future DR applications.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126801"},"PeriodicalIF":6.1,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144068176","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

Numerical investigation of intermittent dryout in diabatic vapor-water annular flow in an upward vertical tube 竖直管内非绝热蒸汽-水环流间歇干化的数值研究

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-12 DOI: 10.1016/j.applthermaleng.2025.126806

Xin Zhang , Jianxin Shi , Xu Chen , Baozhi Sun , Wanze Wu , Qingpeng Zeng

{"title":"Numerical investigation of intermittent dryout in diabatic vapor-water annular flow in an upward vertical tube","authors":"Xin Zhang , Jianxin Shi , Xu Chen , Baozhi Sun , Wanze Wu , Qingpeng Zeng","doi":"10.1016/j.applthermaleng.2025.126806","DOIUrl":"10.1016/j.applthermaleng.2025.126806","url":null,"abstract":"<div><div>Dryout is a key limitation to heat transfer efficiency in high heat flux systems, and its triggering mechanism must be elucidated through the analysis of liquid film interfacial behavior in diabatic annular flow. This study examines vertical upward vapor–liquid diabatic annular flows of water at 7 MPa, with a mass flux of 750 kg/(m<sup>2</sup>·s), and an inlet vapor quality of 0.5, under three distinct heat flux conditions representative of operating conditions in once-through steam generators (OTSGs). The spatial–temporal distributions of liquid film thickness are examined, along with the axial variations in base film thickness and wave amplitude. The relationship between liquid film thickness distribution and wall temperature was explored, with particular attention to the correspondence between the timing of temperature rise and the liquid film thickness reaching a local minimum. The results indicate that the mass source is higher in the base film region, and the rupture of the base film leads to direct vapor-wall contact, causing localized vapor superheating. Higher heat flux results in an increased intermittent dryout fraction.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126806"},"PeriodicalIF":6.1,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144068840","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 model study of two-phase expansion stimulated by rotating impeller 旋转叶轮刺激两相膨胀的实验与模型研究

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2025-05-11 DOI: 10.1016/j.applthermaleng.2025.126804

Xiaoran Li , Weifeng Wu , Jin Yao Ho , Chengqiang Guo , Tianhuangrui Feng , Yin Zhang

{"title":"Experimental and model study of two-phase expansion stimulated by rotating impeller","authors":"Xiaoran Li , Weifeng Wu , Jin Yao Ho , Chengqiang Guo , Tianhuangrui Feng , Yin Zhang","doi":"10.1016/j.applthermaleng.2025.126804","DOIUrl":"10.1016/j.applthermaleng.2025.126804","url":null,"abstract":"<div><div>Experiments of two-phase expansion that happened inside a constant volume chamber installed with a rotating impeller were carried out. This proposed method separated liquid flash from vapor expansion of two-phase expansion, facilitating measurement of temperature and instantaneous flash flow rate, while these parameters couldn’t be measured directly in a practical two-phase expander owning to complex solid structures and rotation of the expander rotors. Additionally, the rotation of the rotors always agitates the fluid, inevitably impacting the instantaneous flash evaporation rate. Thus, the rotating impeller was adopted to simulate the rotation of the rotors in a practical expander. Water served as the working fluid, with an initial liquid height of 175 mm and initial injection temperatures of 110 °C and 120 °C inside the constant volume chamber. The rotation speed range of the impeller was set between 125 and 500 rpm. Experiment results showed that agitating the liquid with the impeller could effectively stimulate the instantaneous flash evaporation rate and the total mass of flash evaporation. The two-phase expansion process was divided into the rapid expansion stage and the gradual expansion stage. Du to the high flash evaporation rate, the rapid expansion stage was suggested to generate power in the expanders. Increasing the rotational speed of the impeller leads to a significant increase in indicated power during the rapid expansion stage. However, in practical expanders, the indicated work will decrease due to the limited built-in volume ratio. A thermal non-equilibrium two-phase expansion model was established based on the principle of bubble growth. The proposed model could predict liquid temperature error fell within ± 0.06 %, while the predicted error of vapor pressure was limited to ± 4.9 %.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"274 ","pages":"Article 126804"},"PeriodicalIF":6.1,"publicationDate":"2025-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144068178","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