Comparison of convective heat transfer characteristics of liquid metals flowing across tube bundles between gravity and zero-gravity conditions
Liquid metal flowing across tube bundles accompanies with strong convective heat transfer ability.Its application is conducive to the miniaturization of heat exchanger equipment and is a good choice for the main heat exchanger design of space reactor.Weightlessness is a typical characteristic of space environment.However,it is not clear in the similarities and differences of the flow and heat transfer characteristics between gravity and zero-gravity conditions in the process of liquid metal flowing across tube bundles,which hinders the development process of liquid metal used in space reactors.Therefore,the turbulent heat transfer characteristics of liquid metal flowing across tube bundles between gravity and zero-gravity conditions are investigated by employing the Reynolds averaged numerical method.The temperature and the velocity distribution are displayed in the local area,and the convective heat transfer characteristics are obtained.It is shown that the convective heat transfer performance is different under gravity and zero-gravity conditions with liquid metal flowing vertically downward.Under the gravity condition,the buoyancy affects the flow and temperature fields,thereby causing a maximum deviation of 10%for friction factor and heat transfer ability compared with the zero-gravity condition.
convective heat transferflowing across tube bundlesliquid metalweightlessnessgravity
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