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The experimental investigation of axial heat conduction effect on the heat transfer analysis in microchannel flow

机译:轴向热传导对微通道流动传热分析的实验研究

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This paper presents the experimental investigation for the effect of axial heat conduction on the heat transfer analysis in microchannel flow. Molecule-based temperature sensors Rhodamine B/DI water and Ru(bpy)/dope have been respectively applied as temperature sensitive fluid and temperature sensitive paint for fluid and surface temperature measurements in a PDMS microchannel chip with parallel channel design. Under constant heat flux from the floor of microchannel, fluid temperature increases upto 13 ℃ have been observed when Reynolds number varies from 15 to 80. Non-linear fluid and surface temperature variations have been identified by molecule-based temperature sensor measurements. More than half of the temperature increase occurs within 1/8 of channel length from the entrance at a Reynolds number of 15. The acquired temperature data show non-linear variation and deviate from the ideal condition, which is linear, predicated by theoretical analysis. The increase of temperature deviation and the shift of maximum temperature deviation toward the channel entrance have been identified at lower Reynolds numbers. The Nusselt numbers obtained from the experimental data are between 2.55 and 2.58 and these are smaller than those from the theoretical analysis in rectangular channel model (4.84) with constant heat flux from one wall. These deviations are attributed to the axial heat conduction which directs portion of heat toward the entrance and reduces convective heat transfer in the fully developed region. The experimental evidence in this study validates the effects of axial heat conduction in micro-channel flow with detailed temperature evolution.
机译:本文介绍了轴向传热对微通道流动传热分析影响的实验研究。基于分子的温度传感器若丹明B / DI水和Ru(bpy)/涂料分别用作具有并行通道设计的PDMS微通道芯片中的流体和表面温度测量的温度敏感流体和温度敏感涂料。在来自微通道底部的恒定热通量下,当雷诺数从15变至80时,观察到流体温度升高至13℃。通过基于分子的温度传感器测量,已识别出非线性流体和表面温度变化。雷诺数为15时,超过一半的温度升高发生在距入口的通道长度的1/8范围内。所获得的温度数据显示出非线性变化,并且偏离了理想条件,该理想条件是线性的,这是通过理论分析得出的。在较低的雷诺数下已确定出温度偏差的增加和最大温度偏差向通道入口的移动。从实验数据获得的Nusselt数在2.55至2.58之间,比从一壁恒定热通量的矩形通道模型(4.84)中的理论分析得出的数值小。这些偏差归因于轴向导热,轴向导热将一部分热量引向入口,并减少了在完全展开区域的对流传热。本研究中的实验证据验证了在详细的温度演化过程中微通道流动中轴向热传导的影响。

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