International Journal of Heat and Fluid Flow最新文献_第8页

Increasing bushing temperature via a heating tube for performance enhancement of ion implanters 通过加热管提高套管温度以提高离子注入器的性能

IF 2.6 3区工程技术

International Journal of Heat and Fluid Flow Pub Date : 2026-03-01 Epub Date: 2025-12-24 DOI: 10.1016/j.ijheatfluidflow.2025.110214

Yoon Hoo Shin , Hyo Jun Sim , Jong Jin Hwang , Seung Jae Moon

{"title":"Increasing bushing temperature via a heating tube for performance enhancement of ion implanters","authors":"Yoon Hoo Shin , Hyo Jun Sim , Jong Jin Hwang , Seung Jae Moon","doi":"10.1016/j.ijheatfluidflow.2025.110214","DOIUrl":"10.1016/j.ijheatfluidflow.2025.110214","url":null,"abstract":"<div><div>This study aims to enhance the performance of an ion implanter by improving temperature control through a heating tube integrated within the bushing. In an ion implanter, gases such as PH<sub>3</sub>, AsH<sub>3</sub>, BF<sub>3</sub>, and GeF<sub>4</sub> are ionized by applying high voltages of up to 80 kV. Consequently, an ion beam is extracted from the electrode. However, residual gases are deposited inside the bushing under relatively low operating temperatures. Consequently, a leakage current flows through the bushing due to the deposited residual gas layer. This results in arcing from the potential differences across the bushing. To address this issue, this study designs and implements a heating tube within the bushing and circulates a heating fluid via the tube to increase the bushing’s temperature. The proposed heating system prevents gas deposition and enhances the efficiency of the deposition process. The optimal condition—defined as achieving a bushing wall temperature of 60°C with minimal energy input—was determined as a FC-3283 flow rate of 24 LPM with an inlet temperature of 100°C. The effectiveness of this solution is evaluated through a combination of experiments and computational fluid dynamics simulations. The experimental results corroborate the simulation outcomes. This integrated experimental–simulation approach is expected to significantly enhance deposition process efficiency. These findings offer valuable insights for optimizing ion implantation performance and reducing the frequency of bushing replacements.</div></div>","PeriodicalId":335,"journal":{"name":"International Journal of Heat and Fluid Flow","volume":"118 ","pages":"Article 110214"},"PeriodicalIF":2.6,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145836477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 various cylindrical hole layouts on film cooling effectiveness of a cavity blade tip 不同圆柱孔布置对空腔叶尖气膜冷却效果的影响

IF 2.6 3区工程技术

International Journal of Heat and Fluid Flow Pub Date : 2026-03-01 Epub Date: 2025-12-17 DOI: 10.1016/j.ijheatfluidflow.2025.110211

Kun Du , Fangshun Zhang , Ding Luo , Wenbin Chen , Cunliang Liu , Bengt Sunden

{"title":"Effects of various cylindrical hole layouts on film cooling effectiveness of a cavity blade tip","authors":"Kun Du , Fangshun Zhang , Ding Luo , Wenbin Chen , Cunliang Liu , Bengt Sunden","doi":"10.1016/j.ijheatfluidflow.2025.110211","DOIUrl":"10.1016/j.ijheatfluidflow.2025.110211","url":null,"abstract":"<div><div>Turbine blade tip clearance exacerbates aerodynamic losses and raises thermal load on the blade tip, detrimentally affecting blade lifespan and reliability. Arranging the film hole is a prevalent approach for blade tip cooling. A rational hole layout is crucial for improving the film cooling effectiveness and minimizing losses. Based on the conventional nine-hole tip layout along the camber line, this study presents a design concept involving moving one, two, or three film holes from the trailing edge region to the leading edge and adjusting the mid-chord holes downward. Five novel film hole layouts are given rise to by this concept. Numerical simulations are carried out to analyze the film cooling effectiveness and the streamline distribution on different film hole layouts. The results show that moving the trailing edge holes forward can enhance coolant flow on the leading edge and on the suction side. As more trailing edge holes are relocated forward, overall film cooling effectiveness is improved. Specifically, the layout with three trailing edge holes relocated to the leading edge has an 11.47% higher area-average film cooling effectiveness than the nine-hole tip layout along the camber line. The layout with three mid-chord holes shifted downward, with a 2.83% increase, enhances the cooling of the suction side on the mid-chord region and overall cooling uniformity. The structure that integrates both methods described above shows a 14.49% increase over the nine-hole tip layout along the camber line. In addition, changes in the positions of the film holes on the blade tip surface will also affect the aerodynamic losses. These findings provide valuable guidance for designing high-efficiency cooling tip structure.</div></div>","PeriodicalId":335,"journal":{"name":"International Journal of Heat and Fluid Flow","volume":"118 ","pages":"Article 110211"},"PeriodicalIF":2.6,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145797336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Flow regime identification in a dual impeller gas-liquid stirred tank reactor using time-series analysis of radioactive particle tracking data 利用放射性粒子跟踪数据的时间序列分析识别双叶轮气液搅拌槽式反应器的流态

IF 2.6 3区工程技术

International Journal of Heat and Fluid Flow Pub Date : 2026-03-01 Epub Date: 2025-12-05 DOI: 10.1016/j.ijheatfluidflow.2025.110167

Roushni Kumari , Raghvendra Gupta , Jayashree Biswal , Miryan C. Cassanello , Rajesh Kumar Upadhyay

{"title":"Flow regime identification in a dual impeller gas-liquid stirred tank reactor using time-series analysis of radioactive particle tracking data","authors":"Roushni Kumari , Raghvendra Gupta , Jayashree Biswal , Miryan C. Cassanello , Rajesh Kumar Upadhyay","doi":"10.1016/j.ijheatfluidflow.2025.110167","DOIUrl":"10.1016/j.ijheatfluidflow.2025.110167","url":null,"abstract":"<div><div>Accurate characterization of flow regimes in gas–liquid stirred tank reactors (STRs) is critical for the design, scale-up, and optimization of multiphase mixing systems. This study investigates three-dimensional liquid flow fields in a lab-scale dual impeller gas–liquid STR (T = 0.19 m), equipped with radial and mixed flow impellers. A non-invasive Radioactive Particle Tracking (RPT) technique was used to capture detailed flow behavior under varying operating conditions. Velocity vector plots, mean liquid velocity, and turbulent kinetic energy (TKE) profiles were analyzed to evaluate the hydrodynamic influence of impeller configuration and impeller spacing. To further understand the chaotic nature of the flow, time-series data from the tracked particle were processed, using Kolmogorov entropy, following the approach of <span><span>Nedeltchev et al. (2003)</span></span> for bubble columns. This entropy-based method enabled identification of flow regimes across different impeller speeds and superficial gas velocities, and impeller-to-impeller spacing to impeller diameter ratio (S/D). Additionally, the individual contributions of the lower and upper impellers to local Kolmogorov entropy were assessed, revealing their distinct roles in flow and bubble dispersion. The integration of RPT measurements with Kolmogorov entropy analysis provides a robust framework for understanding complex flow patterns and enhancing hydrodynamic design in dual impeller STRs.</div></div>","PeriodicalId":335,"journal":{"name":"International Journal of Heat and Fluid Flow","volume":"118 ","pages":"Article 110167"},"PeriodicalIF":2.6,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145692309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Inviscid characteristics of a conical shock wave from a finite cone impinging on a flat plate in a Mach 2 flow 2马赫流动中有限锥撞击平板产生的锥形激波的无粘特性

IF 2.6 3区工程技术

International Journal of Heat and Fluid Flow Pub Date : 2026-03-01 Epub Date: 2025-12-04 DOI: 10.1016/j.ijheatfluidflow.2025.110158

Bikalpa Bomjan Gurung, Sudhir L. Gai, Amna Khraibut, Krishna M. Talluru

{"title":"Inviscid characteristics of a conical shock wave from a finite cone impinging on a flat plate in a Mach 2 flow","authors":"Bikalpa Bomjan Gurung, Sudhir L. Gai, Amna Khraibut, Krishna M. Talluru","doi":"10.1016/j.ijheatfluidflow.2025.110158","DOIUrl":"10.1016/j.ijheatfluidflow.2025.110158","url":null,"abstract":"<div><div>Comparison of the inviscid simulation and experiment data (Gai & Teh, 2000) showed the strong viscous effect of the boundary layer on the plate with separation of the boundary layer. There was a linear relationship between the inviscid and experimental data of wall pressures (<span><math><mrow><msub><mrow><mi>P</mi></mrow><mrow><mn>3</mn><mo>,</mo><mi>m</mi><mi>a</mi><mi>x</mi></mrow></msub><mo>/</mo><msub><mrow><mi>P</mi></mrow><mrow><mn>1</mn></mrow></msub></mrow></math></span>) measured on the symmetry plane. The effect of the interaction between the impinging shock and the trailing edge expansion fan originating from the base of the cone was to reduce the conical shock angle beginning at the expansion head. The expansion fan interaction showed strong dependency on the cone height from the plane. Separation length obtained from the experiment showed a power law dependency on <span><math><mrow><msub><mrow><mi>P</mi></mrow><mrow><mn>3</mn><mo>,</mo><mi>m</mi><mi>a</mi><mi>x</mi></mrow></msub><mo>/</mo><msub><mrow><mi>P</mi></mrow><mrow><mn>1</mn></mrow></msub></mrow></math></span> for all cone angles and cone heights from the surface when normalised by the boundary layer plate thickness at the impingement location.</div></div>","PeriodicalId":335,"journal":{"name":"International Journal of Heat and Fluid Flow","volume":"118 ","pages":"Article 110158"},"PeriodicalIF":2.6,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145692312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 investigation of fast control surface deflections 快速控制曲面挠度的实验与数值研究

IF 2.6 3区工程技术

International Journal of Heat and Fluid Flow Pub Date : 2026-03-01 Epub Date: 2025-12-05 DOI: 10.1016/j.ijheatfluidflow.2025.110177

Ruben B. Seidler , Reinhard Geisler , Andreas Schröder , Jochen Wild

{"title":"Experimental and numerical investigation of fast control surface deflections","authors":"Ruben B. Seidler , Reinhard Geisler , Andreas Schröder , Jochen Wild","doi":"10.1016/j.ijheatfluidflow.2025.110177","DOIUrl":"10.1016/j.ijheatfluidflow.2025.110177","url":null,"abstract":"<div><div>The development of load alleviation for an aircraft requires an accurate and efficient prediction of gust and maneuver loads. In the design of an aircraft the prediction of these unsteady loads has become crucial for the ideal alleviation of gust loads. A database for unsteady aerodynamic responses is however very cost expensive and time consuming to generate, in an experiment and with numerical simulations. An efficient tool for the computation of aerodynamic responses is the linear frequency domain solver, which allows the prediction of amplitude and phase shift of any periodic oscillation of body or flow in the frequency domain. The unsteady response allows a fast and efficient prediction for any arbitrary unsteady change of in example a control surface deflection or a gust speed. The validation of the linear frequency domain solver for unsteady aerodynamics is crucial, so that its prediction quality is ensured. A wind tunnel experiment was set up, which focused on fast control surface deflections and analyzed the capabilities and accuracy of the method. The experiment was accompanied by two- and three-dimensional URANS simulations, which allow a more detailed comparison and help to increase the understanding of the flow physics. For higher frequencies of the control surface oscillation, the adjusting position of the stagnation point on the leading edge lags behind the actual control surface position as if it were in a quasi-steady state. This leads to a phase lag between motion and resulting force and a lower lift response amplitude.</div></div>","PeriodicalId":335,"journal":{"name":"International Journal of Heat and Fluid Flow","volume":"118 ","pages":"Article 110177"},"PeriodicalIF":2.6,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145692308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Influence of turbulence inflow conditions on aeroacoustics of wall-bounded flows 湍流入流条件对壁面流动气动声学的影响

IF 2.6 3区工程技术

International Journal of Heat and Fluid Flow Pub Date : 2026-03-01 Epub Date: 2025-12-26 DOI: 10.1016/j.ijheatfluidflow.2025.110216

Ronith Stanly , Eman Bagheri , Timofey Mukha , Philipp Schlatter

{"title":"Influence of turbulence inflow conditions on aeroacoustics of wall-bounded flows","authors":"Ronith Stanly , Eman Bagheri , Timofey Mukha , Philipp Schlatter","doi":"10.1016/j.ijheatfluidflow.2025.110216","DOIUrl":"10.1016/j.ijheatfluidflow.2025.110216","url":null,"abstract":"<div><div>A scale-resolving simulation of a turbulent boundary layer (TBL) requires an inflow condition that introduces turbulence into the domain. The boundary values must accurately approximate real turbulent structures in order to minimize the inflow adaption and to allow for sustained growth of the TBL. In practice, all inflow conditions incur an error on the flow field directly downstream. This error is typically quantified as the distance from the inlet at which the velocity statistics recover correct values. However, this measure is insufficient for simulations where evaluating acoustic pressure is an important outcome, necessitating a quantification of the error in the pressure field. This aspect of inflow generation is currently not addressed in the literature and constitutes the main topic of this article. We show that violation of the continuity equation near the inflow region generates spurious pressure fluctuations over the entire domain, leading to poor sound prediction results in low Mach number regimes. In particular, we look at three known inflow generation methods (namely, precursor simulations, the synthetic eddy method, and recycling using an upstream open channel flow) and evaluate how silent they are. For evaluation, the sensitive case of a TBL developing over a flat plate is used as the test case. The recycling method satisfies the divergence-free condition and introduces the least amount of spurious numerical noise to the sound field while giving reasonably good agreement in terms of the overall development of the TBL.</div></div>","PeriodicalId":335,"journal":{"name":"International Journal of Heat and Fluid Flow","volume":"118 ","pages":"Article 110216"},"PeriodicalIF":2.6,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145836936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

CFD investigation of thermal management and flow behavior in an optimized air-cooled tail rotor propulsion system 优化风冷尾桨推进系统的热管理与流动特性CFD研究

IF 2.6 3区工程技术

International Journal of Heat and Fluid Flow Pub Date : 2026-03-01 Epub Date: 2025-12-14 DOI: 10.1016/j.ijheatfluidflow.2025.110202

Hyowon Bang , Huichan Lee , Giyoung Park , Sungjae Kim , Seangwock Lee

{"title":"CFD investigation of thermal management and flow behavior in an optimized air-cooled tail rotor propulsion system","authors":"Hyowon Bang , Huichan Lee , Giyoung Park , Sungjae Kim , Seangwock Lee","doi":"10.1016/j.ijheatfluidflow.2025.110202","DOIUrl":"10.1016/j.ijheatfluidflow.2025.110202","url":null,"abstract":"<div><div>As aerospace propulsion steadily transitions toward electrification, effectively dissipating heat in compact electric tail rotor motors has become a pressing design challenge. In this study, a high-fidelity computational fluid dynamics (CFD) framework is employed to investigate an air-cooled propulsion system specifically configured for helicopter tail rotor applications. Three passive geometric modifications are examined in detail: widening of lateral duct openings, introducing a 15° inclination to the duct sidewalls, and incorporating rotating blades along the central shaft. The optimized configuration demonstrated substantial thermal gains, reducing peak temperatures by 10.38% in the winding, 8.23% in the magnet, and 19.0% in the shaft. This enhancement was primarily attributed to enhanced airflow penetration, boundary-layer thinning, and the development of favorable secondary recirculation zones. Convective heat transfer performance was also elevated, with Nusselt numbers increasing by up to 11.6% across key components. Importantly, these thermal benefits were achieved while maintaining aerodynamic integrity, as the simulated thrust deviated by only 1.34% from experimental rig measurements. The results highlight how targeted, flow-physics-based passive design strategies can simultaneously improve cooling performance and preserve propulsion efficiency. This approach offers a scalable and integration-friendly pathway for next-generation electric rotorcraft requiring lightweight, thermally resilient tail rotor systems.</div></div>","PeriodicalId":335,"journal":{"name":"International Journal of Heat and Fluid Flow","volume":"118 ","pages":"Article 110202"},"PeriodicalIF":2.6,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145797236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Comparative study on heat extraction performance and economic feasibility between medium-deep coaxial and U-type ground heat exchangers 中深同轴与u型地热交换器排热性能及经济可行性对比研究

IF 2.6 3区工程技术

International Journal of Heat and Fluid Flow Pub Date : 2026-03-01 Epub Date: 2025-12-06 DOI: 10.1016/j.ijheatfluidflow.2025.110170

Pengtao Wang , Rui Liang , Shimin Wang , Junyu Feng , Jie Zhang , Shengshan Bi

{"title":"Comparative study on heat extraction performance and economic feasibility between medium-deep coaxial and U-type ground heat exchangers","authors":"Pengtao Wang , Rui Liang , Shimin Wang , Junyu Feng , Jie Zhang , Shengshan Bi","doi":"10.1016/j.ijheatfluidflow.2025.110170","DOIUrl":"10.1016/j.ijheatfluidflow.2025.110170","url":null,"abstract":"<div><div>This study utilizes a geothermal heating project located in Xi’an as a case study, developing full-scale numerical models for medium-deep coaxial borehole heat exchangers (DCBHE) and medium-deep U-type borehole heat exchangers (DUBHE) at equivalent depths. Through extensive heat transfer simulations conducted over five cycles, the research provides a comprehensive comparison of the heat extraction efficiency and economic viability of the two types of ground heat exchangers. This comparison employs a ratio method that accounts for pump energy losses, the levelized cost of heat (LCOH), and net present value (NPV) metrics. The findings indicate that the heat exchange per unit length for DCBHE and DUBHE ranges from 123.1 to 149.5 W/m and 93.9 to 170.71 W/m, respectively, with a critical flow rate of 7.21 kg/s. When incorporating pump power consumption, the critical flow rate is determined to be 6.62 kg/s, which corresponds to a comprehensive heat exchange per unit length of 127.7 W/m. Beyond this flow rate, the comprehensive heat transfer performance of DUBHE surpasses that of DCBHE. Therefore, this study divides the heat extraction zones into low-flow zones and high-flow zones based on the critical flow rate of 6.62 kg/s, providing a qualitative identification basis for selecting appropriate flow rate conditions for different types of heat exchangers. The economic analysis reveals that at the critical flow rate, the cost per unit of heat extraction for DCBHE exceeds that of DUBHE, and as the heat extraction duration increases, the NPV of DUBHE becomes more favorable compared to DCBHE. Consequently, DUBHE is determined to be more economically viable than DCBHE.</div></div>","PeriodicalId":335,"journal":{"name":"International Journal of Heat and Fluid Flow","volume":"118 ","pages":"Article 110170"},"PeriodicalIF":2.6,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145748813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Thermal-hydraulic and structural analysis of a liquid-cooled heat sink with rotating twisted tape inserts 带旋转扭带插片的液冷散热器的热水力和结构分析

IF 2.6 3区工程技术

International Journal of Heat and Fluid Flow Pub Date : 2026-03-01 Epub Date: 2025-12-29 DOI: 10.1016/j.ijheatfluidflow.2025.110225

Abdullah Masoud Ali , Mohammad Ismail , Aldo Rona , Audrius Bagdanavicius , Areej Masoud Ali

{"title":"Thermal-hydraulic and structural analysis of a liquid-cooled heat sink with rotating twisted tape inserts","authors":"Abdullah Masoud Ali , Mohammad Ismail , Aldo Rona , Audrius Bagdanavicius , Areej Masoud Ali","doi":"10.1016/j.ijheatfluidflow.2025.110225","DOIUrl":"10.1016/j.ijheatfluidflow.2025.110225","url":null,"abstract":"<div><div>This study investigates advanced thermal management techniques for liquid-cooled electronics, aiming to enhance cooling efficiency through innovative rotating twisted tape inserts in the heat sink. A water-cooled heat sink is analysed at an inlet temperature of 300 K, with Reynolds numbers ranging from 100 to 400, and a heat flux of 180,000 W/m<sup>2</sup>. Five configurations are examined: a base case, a stationary twisted tape (ω = 0 rpm), and rotating twisted tapes at 300, 600, and 900 rpm. Results show that both stationary and rotating twisted tapes significantly reduce the base plate temperature compared to the base case. At Re = 400, temperature drops of 10.73 K, 13.12 K, 15.36 K, and 16.24 K are observed with ω = 0, 300, 600, and 900 rpm, respectively, demonstrating improved thermal performance that can enhance the reliability and lifespan of cooled electronics. While stationary tapes increase the friction factor due to intensified fluid-wall interactions, rotating tapes decrease the axial pressure drop by increasing fluid momentum. Fluid-structure interaction analysis indicates minimal deformation in copper and aluminium tapes, with maximum displacement occurring axially. Aluminium shows slightly higher deformation (2.850 × 10<sup>−5</sup> mm) than copper (1.605 × 10<sup>−5</sup> mm). These findings offer valuable insights for optimising thermal–hydraulic performance and structural integrity in electronic cooling systems.</div></div>","PeriodicalId":335,"journal":{"name":"International Journal of Heat and Fluid Flow","volume":"118 ","pages":"Article 110225"},"PeriodicalIF":2.6,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145880361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Theoretical study on leakage characteristics of an oil-injected single screw CO2 compressor 喷油单螺杆CO2压缩机泄漏特性的理论研究

IF 2.6 3区工程技术

International Journal of Heat and Fluid Flow Pub Date : 2026-03-01 Epub Date: 2025-12-31 DOI: 10.1016/j.ijheatfluidflow.2025.110230

Qingchun Zhang , Junling Yang , Yanan Li , Zhentao Zhang , Hualin Yang , Yanchang Song , Yan He

{"title":"Theoretical study on leakage characteristics of an oil-injected single screw CO2 compressor","authors":"Qingchun Zhang , Junling Yang , Yanan Li , Zhentao Zhang , Hualin Yang , Yanchang Song , Yan He","doi":"10.1016/j.ijheatfluidflow.2025.110230","DOIUrl":"10.1016/j.ijheatfluidflow.2025.110230","url":null,"abstract":"<div><div>Single Screw CO<sub>2</sub> Compressor (SSCC) is an essential component for utilizing CO<sub>2</sub> as working fluid. The miscibility of lubricating oil and CO<sub>2</sub> makes it more complicated to determine leaks in compressors. To investigate the leakage characteristics of the SSCC, a mathematical model for its operating process is developed. This model integrates an oil and gas two-phase leakage model, which considers the solubility of oil and CO<sub>2</sub>. The study examined SSCC leakage and performance across varying clearances, speeds, and suction/discharge pressures. Results show that, under constant operating conditions, only indirect leakage of CO<sub>2</sub> dissolved in the oil occurs at smaller clearances. However, as the clearance increases, direct leakage of CO<sub>2</sub> is observed. An increase in clearance results in greater leakage and a decrease in volume and adiabatic efficiency. In addition, the effect of the fitting clearance on leakage is significantly more pronounced than meshing clearance. At the same speed, an increase in the suction pressure or a decrease in the discharge pressure increases the compressor’s volumetric efficiency. As the suction or discharge pressure increases, the adiabatic efficiency first increases and subsequently decreases. The optimum suction and discharge pressures for achieving maximum adiabatic efficiency at varied rotational speeds differ.</div></div>","PeriodicalId":335,"journal":{"name":"International Journal of Heat and Fluid Flow","volume":"118 ","pages":"Article 110230"},"PeriodicalIF":2.6,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145880365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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