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首页> 外文期刊>International Journal of Heat and Mass Transfer >Thermal performances of corrugated channel with skewed wall waves at rolling and pitching conditions
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Thermal performances of corrugated channel with skewed wall waves at rolling and pitching conditions

机译：倾斜和倾斜条件下壁波偏斜的波纹通道的热性能

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摘要

This experimental study investigates the thermal performances of a narrow wavy channel which swings about two orthogonal axes under single and compound rolling and pitching oscillations. Full-field Nusselt number (Nu) images over the wavy channel wall are detected at static and swinging conditions by infrared thermography method and examined comparatively to highlight the influences of rolling and pitching oscillations on heat transfer performances. A set of selected heat transfer data illustrates the individual and interdependent influences of rolling and pitching oscillations on the detailed Nu distributions and the area-averaged Nusselt numbers (Nu). Pressure drop coefficients (f) for isothermal flows and thermal performance factors (TPF) at static and swinging conditions are subsequently analyzed. For this particular channel configuration, the single rolling or pitching oscillation elevates Nil from the static references; whereas the synergistic effects of compound rolling and pitching oscillations with either harmonic or non-harmonic rhythms suppress the beneficial heat transfer impacts by single rolling or single pitching oscillations. Buoyancy effects in isolation elevate Nu but are weakened as the relative strength of swinging force enhances. Pressure drop coefficients (f) consistently increase as the relative strength of swinging forces increases. At the expense of increased pressure drop penalties for heat transfer augmentations by swinging oscillations, the thermal performance factor (TPF) respectively increases and decreases as Reynolds number (Re) increases with laminar and turbulent reference conditions. Empirical heat-transfer and pressure-drop correlations are generated to permit the evaluations of individual and interactive effects of single and compound swinging force effects with buoyancy interactions on Nu and f coefficients. By the aid of these Nu and f correlations, the favorable and worse operating conditions in terms of the swinging parameters for the TPF properties of this corrugated wavy channel are identified.
机译：这项实验研究调查了一个狭窄的波浪形通道的热性能，该通道在单次和复合滚动和俯仰振荡下绕两个正交轴摆动。通过红外热像法在静态和摆动条件下检测波浪通道壁上的全场努塞尔数（Nu）图像，并进行比较检查，以突出滚动和俯仰振荡对传热性能的影响。一组选定的传热数据说明了滚动和俯仰振荡对详细的Nu分布和面积平均Nusselt数（Nu）的个体和相互影响。随后分析了静态和摆动条件下的等温流压降系数（f）和热性能因子（TPF）。对于这种特殊的通道配置，单次滚动或俯仰振荡会使Nil从静态参考点升高；而具有谐波或非谐波节奏的复合摇摆和俯仰振荡的协同效应则抑制了单次摇摆或单次俯仰振荡带来的有益的传热影响。隔离中的浮力作用会提高Nu值，但会随着摆力的相对强度增强而减弱。压降系数（f）随着摆力的相对强度增加而持续增加。以通过摆动振荡增加传热增加的压降损失为代价，随着层流和湍流参考条件下雷诺数（Re）的增加，热性能系数（TPF）分别增加和减少。生成经验传热和压降相关性，以允许评估单个和复合摆动力效应与Nu和f系数的浮力相互作用的单个和相互作用效应。借助于这些Nu和f相关性，就该波纹波浪通道的TPF特性的摆动参数而言，确定了有利和较差的工作条件。

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