螺旋管内单相流动周向非均匀传热现象的数值模拟

Numerical Simulation of Circumferential Non-Uniform Heat Transfer of Single-Phase Flow in Helical Pipes

采用Reynolds应力模型针对螺旋管内的单相流动周向非均匀传热现象开展数值模拟研究.基于与螺旋管传热实验数据的对比,验证该数值计算的正确性.研究发现:螺旋管周向传热分布随着重力加速度与离心力加速度之比(?)的变化而变化.导致这种现象的原因可能是螺旋管周向传热分布受离心力和重力的共同作用,?的变化引起了合力方向的变化,进而影响了螺旋管的周向传热分布;?是影响螺旋管单相流动周向传热分布的主要因素;分析总结管壁周向温度分布随加速度比、螺旋直径、螺旋升角、螺旋管水力学直径等参数的变化规律及其成因.

In this paper, the Reynolds stress model is used to simulate the circumferential non-uniform heat transfer of single-phase flow in a helical pipe. The calculation is verified based on the comparison with the experimental data. It is found that the ratio of gravity acceleration to centrifugal force acceleration(?) affects the circumferential heat transfer distribution of helical pipes. The reason for this is that the changes of ? lead to the changes of the direction of resultant force of gravity and centrifugal force. It is concluded that the main factor affecting the circumferential heat transfer distribution is ?. Besides, the changing rules and the effects of geometry parameters of helical pipes, such as the ratio of gravity acceleration to centrifugal force acceleration, pitch circle diameter, pipe hydraulic diameter, and spirally ascend angle, on the circumferential heat transfer distribution are discussed.