Numerical Analysis of Transfer of Heat by Forced Convection in a Wavy Channel

N. A. Madlool, M. Alshukri, A. Alsabery, A. Eidan, I. Hashim
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Abstract

Convective heat transfer of laminar forced convection in a wavy channel is studied in this paper. Numerical simulations of the 3D steady flow of Newtonian fluid and heat transfer characteristics are obtained by the finite element method. The effects of the Reynolds number ((10 ≤Re≤1000), number of oscillations (0 ≤N≤5) and amplitude of the wall (0.05 ≤A≤0.2) on the heat transfer have been analyzed. The results show that the average Nusselt number is elevated as the Reynolds number is raised, showing high intensity of heat transfer, as a result of the intensified effects of the inertial and zones of recirculation close to the hot wavy wall. The rate of heat transfer increases about 0.28% with the rise of the number of oscillations. In the transfer of heat along a wavy surface, the number of oscillations and the wave amplitude are important factors. With an increment in the number of oscillations, the maximal value of the average velocity is elevated, and its minimal value occurs when the channel walls are straight. The impact of the wall amplitude on the average Nusselt number and dimensionless temperature tends to be stronger compared to the impact of the number of oscillations. An increase of the wall amplitude improves the rate of heat transfer about 0.91% when the Reynolds number is equal 100. In addition, when the Reynolds number is equal 500, the rate of heat transfer grows about 1.1% with the rising of the wall amplitude.
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波浪通道中强制对流传热的数值分析
本文研究了波浪通道中层流强迫对流的对流换热问题。采用有限元法对牛顿流体的三维定常流动和传热特性进行了数值模拟。分析了雷诺数(10≤Re≤1000)、振荡次数(0≤N≤5)和壁面振幅(0.05≤A≤0.2)对换热的影响。结果表明:随着雷诺数的增加,平均努塞尔数增大,表明热波壁附近的惯性和再循环区作用增强,传热强度高;随着振荡次数的增加,换热速率增加约0.28%。在波浪表面的热传递中,振荡次数和振幅是重要的影响因素。随着振荡次数的增加,平均流速的最大值升高,而当通道壁为直线时,平均流速的最小值出现。壁面振幅对平均努塞尔数和无量纲温度的影响比振荡次数的影响更大。当雷诺数为100时,壁面振幅的增加使换热率提高了0.91%。此外,当雷诺数为500时,随着壁面振幅的增大,换热速率增长约1.1%。
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CiteScore
4.50
自引率
16.00%
发文量
83
审稿时长
8 weeks
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