印刷电路板通道的高温传热和阻力特性研究

Study on the Heat Transfer and Pressure Drop of Printed Circuit Heat Exchanger

印刷电路板换热器是超高温气冷堆等高温能量利用与回收领域中极具潜力的备选强化传热技术之一,本文通过数值模拟方法对典型Z字形印刷电路板(PCHE)传热通道的传热和阻力特性开展了相关研究。计算结果表明:层流模型可以较好地获得Z字形PCHE通道的阻力和传热性能,Z字形PCHE通道的阻力系数大于半圆管直通道的阻力系数;当热侧和冷侧通道流体入口温度均不发生改变时,增加两侧流体的质量流量,通道内的阻力系数随之减小,传热效率也稍微减小;当两侧流量及冷侧入口温度均不发生改变时,提高热侧通道入口温度,通道内阻力系数成线性增大,传热效率也随之提高。

Printed circuit heat exchanger(PCHE) is one of the promising candidates in the hightemperature energy utilization and recovery fields,such as Very High Temperature Reactor(VHTR).In the present paper,the heat transfer and pressure drop characteristics of a typical PCHE with a Zigzag channel are numerically studied.The results indicate that the heat transfer and pressure drop performances could be predicted well by the laminar flow model.The friction factor of Zigzag channel is higher than that of semicircle channel.When the inlet temperature on both sides is constant,the friction factor and heat transfer effectiveness decrease with the increase of mass flow rates.When the mass flow rate on both sides and the inlet temperature on cold side are constant,the friction factor decreases linearly and the heat transfer effectiveness increases with the increase of the inlet temperature on hot side.