Numerical investigation of heat transfer enhancement in mini-channels with modified surface protrusions

IF 2.6 3区工程技术 Q2 ENGINEERING, MECHANICAL International Journal of Heat and Fluid Flow Pub Date : 2025-06-01 Epub Date: 2025-02-17 DOI:10.1016/j.ijheatfluidflow.2025.109766

Yuan Wang

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Abstract

Numerical simulation is conducted to investigate the heat transfer enhancement characteristics of channel surface modifications. Two-dimensional Inconel 718 mini-channels with modified triangular surface protrusions are used, employing supercritical-pressurized n-decane as the working fluid at an outlet pressure of 3.0 MPa and an inlet mass flow rate of 1 kg/s. A set of 76 test cases are designed to examine the influence of protrusion geometry, distribution, and varying channel surface heat flux ranging from 0.5 MW/m² to 1.0 MW/m². Structural temperature, average heat transfer coefficient h_avg, and friction factor f are calculated. Effects of the protrusion location and geometric parameters are discussed. It is found that protrusion height positively dominates both h_avg and f, with Pearson’s correlation coefficient r of 0.78085 and 0.78316, respectively. The protrusion leading length x₁ has a slightly higher impact on h_avg compared to the trailing length x₂, with r_h_avg-_x₁ = 0.35053 and r_h_avg-_x₂ = 0.30534. An increase in x₂ shows a more profound impact on f compared to x₁. Lower inter-convexity distance, increased convexity height and convexity leading length are recommended for heat transfer enhancement. The outcomes of the present study provide valuable insights for optimizing cooling channels in thermal protection systems under high heat flux and supercritical conditions.

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带有改进表面突起的微型通道强化传热的数值研究

通过数值模拟研究了通道表面改性的强化传热特性。采用改进三角形表面凸起的二维Inconel 718微型通道，工作流体为超临界加压正十二烷，出口压力为3.0 MPa，进口质量流量为1 kg/s。设计了一组76个测试案例，以检查突出的几何形状、分布以及变化的通道表面热通量（0.5 MW/m2至1.0 MW/m2）的影响。计算了结构温度、平均换热系数和摩擦系数f。讨论了凸点位置和几何参数的影响。结果表明，突出高度对has和f均有显著的正支配作用，Pearson相关系数r分别为0.78085和0.78316。突出超前长度x1对hav的影响略高于超前长度x2，其中rhavg-x1 = 0.35053, rhavg-x2 = 0.30534。与x1相比，x2的增加对f的影响更大。建议减小凸间距离，增加凸高度和凸导长度来增强传热。本研究结果为高热流密度和超临界条件下热保护系统的冷却通道优化提供了有价值的见解。

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来源期刊

International Journal of Heat and Fluid Flow 工程技术-工程：机械

CiteScore

5.00

自引率

7.70%

发文量

131

审稿时长

33 days

期刊介绍： The International Journal of Heat and Fluid Flow welcomes high-quality original contributions on experimental, computational, and physical aspects of convective heat transfer and fluid dynamics relevant to engineering or the environment, including multiphase and microscale flows. Papers reporting the application of these disciplines to design and development, with emphasis on new technological fields, are also welcomed. Some of these new fields include microscale electronic and mechanical systems; medical and biological systems; and thermal and flow control in both the internal and external environment.