螺旋槽管中单相水与油湍流摩擦阻力与传热特性

对单相水与油分别在4根不同几何参数的螺旋槽管中湍流摩擦阻力与传热特性进行了试验研究。以动量传递与热量传递的模拟理论为基础,由试验结果的关联得到了动量传递粗糙度函数（R函数）与热量传递粗糙度函数（G函数）的表达式,并与前人工作进行了比较。针对油的Pr随温度变化较大的特性,提出了改进的强化传热性能评价方法,并据此对1号与2号试验管进行了评价。研究结果可用于换热器设计及优化螺旋槽管几何参数。

TURBULENT FLOW FRICTION AND HEAT TRANSFER CHARACTERISTICS OF SINGLE-PHASE WATER AND OIL IN SPIRALLY CORRUGATED TUBES

An experimental investigation is carried out on friction and heat transfer characteristics of four spirally corrugated tubes with various geometrical parameters for the turbulent flow of single - phase water and oil. The correlations of momentum transfer roughness function ( R - function) and heat transfer roughness function ( G - function) are developed on the basis of momentum and heat transfer analogy from the present data and are compared with the results of previous investigators. A modified procedure is proposed to evaluate the performance of enhanced heat transfer concerning the large variation of oil Pr with temperature, and it is used for the performance evaluation of tube 1 and 2. Tne investigation results can be applied to heat exchanger design and optimization of geometrical parameters of spirally corrugated tubes.