Study on heat transfer characteristics of supercritical methane in rectangular channel
In order to explore the influence of gravity on the heat transfer performance of rec-tangular regenerative cooling channel under unilateral heating,the RNG k-e turbulence model was used to study the flow and heat transfer performance of methane in a rectangular curved tube under supercritical pressure.The effects of gravity on parameters such as inner wall temperature,heat transfer coefficient and heat flux density under four heating conditions were investigated,and the PEC factor was introduced to analyze the effect of gravity on heat transfer enhancement.The re-sults show that the existence of gravity in the straight pipe section causes the secondary flow in the pipe,the mixing between the fluids is intensified,and the heat transfer performance of the pipe is improved,but the gravity in some curved pipe sections slightly reduces the heat transfer perform-ance.When θ=90°,the heat transfer coefficient peaks under four heating conditions.From the distribution of dimensionless numbers,the heat transfer capacity of the channel is optimal,and the non-gravity pipeline is more significant.By comparing the PEC factors,it is found that gravity enhances the overall heat transfer performance of the regenerative cooling pipe,and the upper wall is more obvious when heated.
supercritical methaneregenerative coolingrectangular bending tubenon-uni-form heatinggravitycentrifugal force
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