具有凸窝粗糙度的锥形插片换热器管的热流体模拟

B. Singh, V. S. Bisht, P. Bhandari, K. Rawat
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引用次数: 12

摘要

本文利用有限体积法研究了锥形插片换热器管内的热流特性。为了提高换热率,锥形刀片采用了两种不同的粗糙度,即凸形粗糙度和凹陷粗糙度。采用RNG湍流模型的三维计算模型进行仿真,并在3种不同直径(3 mm、6 mm和9 mm)和2种不同间距(120 mm和180 mm)下对凸起和凹陷粗糙度进行了模拟。用Dittus-Boelter方程和Blasius方程分别对Nusselt数和摩擦系数进行了验证。当热流密度为1200w /m2时,在雷诺数为5000 ~ 30000范围内,预测了粗糙度、直径和节距对努塞尔数和摩擦因数的影响。结果表明,凸出型粗糙度的热性能因子优于凹窝型粗糙度,且直径为6 mm的粗糙度均优于直径为3 mm和9 mm的粗糙度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Thermo-Fluidic Modelling of a Heat Exchanger Tube with Conical Shaped Insert having Protrusion and Dimple Roughness
In the present work, thermo-fluidic behavior of a heat exchanger tube with conical shaped insert has been investigated with the help of finite volume method. To enhance the heat transfer rate, two different types of roughness has been used in conical insert i.e. protrusion and dimple roughness. A three-dimensional computational model with  RNG turbulence model is used for the simulation and it has been performed for three different diameters (3 mm, 6 mm and 9 mm) and two different pitch space (120 mm and 180 mm) for both protrusion and dimple roughness. The present model has been validated with Dittus-Boelter equation and with Blasius equation for Nusselt number and friction factor, respectively. For a constant heat flux of 1200 W/m2, effect of roughness, diameter and pitch on Nusselt number and friction factor has been predicted for Reynold number range of 5000 to 30000. From the result, it is found that, the protrusion shaped roughness has better thermal performance factor than dimple shape and diameter of 6 mm has performed better than 3 mm and 9 mm for both the cases of roughness due to favorable flow dynamics.
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