超临界压力下低温甲烷在螺旋管内传热数值研究  

Heat transfer study of methane in a helical coiled tube at supercritical pressure

作　　者：王成刚[1] 孙宝坤[1] 林纬[1] 郑晓敏 

机构地区：[1]武汉工程大学机电工程学院,武汉430205 [2]湖北迪峰船舶技术有限公司,武汉430073

出　　处：《低温与超导》2018年第2期1-5,14,共6页Cryogenics and Superconductivity

基　　金：国家自然科学基金项目(50976080);武汉工程大学研究生教育创新基金项目(CX2016033)资助

摘　　要：为揭示超临界LNG螺旋管汽化器的传热机理,应用雷诺应力模型,在等壁温条件下,对超临界压力低温甲烷在螺旋管内流动与传热特性进行了数值研究。研究结果表明,当主流体温度小于准临界温度,浮升力是造成管截面内流体温度分布不均的主要原因。反之,由于离心力的作用,较低温流体出现在管截面外侧区域。当主流体温度小于和接近准临界温度时,浮升力可明显提高换热系数,在准临界点处换热系数出现峰值,且压力对其有一定影响。The heat transfer of methane at supercritical pressure in a helical coil tube was numerically investigated using the Reynolds stress model under the constant wall temperature. Results show that, when the bulk temperature is less than the pseudocritical temperature, the buoyancy force causes fluid non - uniform temperature distributions over the tube cross section. Beyond the pseudocritical temperature, the fluid with lower temperature appears near the outer of the helical coil tube owing to the centrifugal force. When the bulk temperature is less than or near the pseudocritical temperature, the buoyancy force enhances the heat transfer coefficient. The peak value of the heat transfer coefficient usually occurs in the pseudocritical temperature and depends on the pressure.

关 键 词：螺旋管 超临界压力 甲烷 换热 

分 类 号：TK124[动力工程及工程热物理—工程热物理]