Simulation Study on Heat Transfer Characteristics of Needle-Type Smoke Tubes in Boilers
Enhanced heat transfer technology is employed to investigate a needle-type tube heat exchanger.Through nu-merical simulations,a comparative analysis of the heat transfer performance of different layouts and structural configura-tions of needle-type tubes is conducted,with a primary focus on studying the mechanisms behind enhanced heat trans-fer.By analyzing the flow characteristics of flue gas within the smoke tubes,it is observed that the predominant flow is laminar,which results in sub-optimal heat transfer performance of the heat exchanger.Improvement is achieved by adding needle-like fins to disrupt the fluids boundary layer,enhance fluid mixing,and create a strong convective envi-ronment,thereby significantly improving the heat transfer capability of the heat exchanger.Numerical simulations of the flow and heat exchange processes of the heat exchanger's heat transfer unit are performed,discussing the temperature field and velocity field distributions within the unit domain,and comparing the results with data from different operating condi-tions.The paper also analyzes the impact of different quantities,heights,and arrangements of the needle-like fins on the heat transfer performance of the heat exchanger.The numerical simulations indicate that under constant temperature conditions,the quantity,height,arrangement,and flue gas load of the needle-like fins have a significant impact on the heat transfer performance of the heat exchanger.
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维普
