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.
出处
《低温与超导》
CAS
北大核心
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
关键词
螺旋管
超临界压力
甲烷
换热
Helical coil tube, Supercritical pressure, Methane, Heat transfer
