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由于离心力,科氏力,和离心型浮力(Centrifugal-typeBuoyancyforce)同时出现,使得旋转弯管内的流动和换热特性更为复杂。本文考虑了温度与密度的耦合关系,对旋转弯管的对流换热问题进行了数值研究。分析了不同F数(科氏力和离心力之比),RaΩ数(旋转Rayleigh数),以及Ro数(Rossby数)下的二次流动、轴向主流、温度场、摩擦系数比、努塞特数比变化规律。为工程上解决旋转弯管道内耦合对流换热问题提供了可靠的理论依据。
Centrifugal-type buoyancy forces occur simultaneously due to centrifugal force, Coriolis force, and more complicated flow and heat transfer characteristics within the swirler. In this paper, the coupling between temperature and density is considered, and the numerical simulation of the convective heat transfer in a rotating elbow is carried out. The effects of different F numbers (ratio of Coriolis force and centrifugal force), RaΩ number (rotational Rayleigh number) and Roby number (Rossby number) on secondary flow, axial main flow, temperature field, coefficient of friction, Number of changes in the law. It provides a reliable theoretical basis for solving the problem of coupled convective heat transfer in a rotating curved pipe in engineering.