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A theoretical model for the prediction of the critical heat flux in heated microchannels

机译：预测加热微通道中临界热通量的理论模型

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摘要

A theoretical model for the prediction of the critical heat flux of refrigerants flowing in heated, round microchannels has been developed and presented here. The model is based on the two-phase conservation equations and includes the effect of the height of the inter-facial waves of the annular film. Validation has been carried out by comparing the model, a numerical solution of a non-linear system of five differential equations, with a critical heat flux (CHF) database including three different refrigerants from two different laboratories. More than 96% of the data are predicted within a ±20% error band and a mean absolute error of 8%. Furthermore, it is also possible to predict CHF data from a third laboratory for water and R-113 flowing in rectangular (using the width of the channel as the characteristic dimension) and circular microchannel heat sinks with multiple channels. All together, 90% of the entire database, including four different fluids and different geometries, are predicted by the model within a ±20% error band and a mean absolute error of 9.3% for channels from 0.215 to 3.15 mm in size, mass fluxes from 29 to 1600 kg/m~2 s, heated lengths from 10 to 126 mm and subcoolings from 2 to 77 ℃.
机译：已经开发并提出了用于预测在加热的圆形微通道中流动的制冷剂的临界热通量的理论模型。该模型基于两相守恒方程，并包括环形薄膜界面波高度的影响。通过比较该模型（包含五个微分方程的非线性系统的数值解）与包含两个实验室的三种不同制冷剂的临界热通量（CHF）数据库，进行了验证。预计在±20％的误差带和8％的平均绝对误差范围内预测超过96％的数据。此外，对于来自矩形的水和R-113（使用通道的宽度作为特征尺寸）和具有多个通道的圆形微通道散热器，也可以从第三实验室预测CHF数据。该模型总共预测了整个数据库的90％，包括四种不同的流体和不同的几何形状，误差范围为±20％，对于尺寸为0.215至3.15 mm的通道，质量通量，平均绝对误差为9.3％。从29到1600 kg / m〜2 s，加热长度从10到126 mm，过冷2到77℃。

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