An experimental and numerical study of turbulent flow and heat transfer for the channel with an array of spiral-wing pin-fins

  • 韋 匕升

Student thesis: Doctoral Thesis

Abstract

The current study proposes an innovative spiral-wing pin fin array as a new type of passive heat transfer enhancement (HTE) means The aerothermal performances of the channel with the spiral-wing pin fin array are experimentally and numerically studied at the Reynolds numbers between 5500 and 20 000 The numerical simulation is carried out using the commercial software ANSYS-Fluent The heat transfer characteristics and flow structures are interactively analyzed to determine the dominant flow physics relevant to the heat transfer performance When the coolant flows through two adjacent pin-fins in a pin-row it is tripped by the spiral wings attached on a cylindrical pin to generate various vortical flows to raise the endwall heat transfer rate by promoting the core-to-wall fluid mixings When Reynolds number is increased from 5500 to 20 000 the ratio of endwall average Nusselt number to the plain tube reference is increased to 5 4-5 03 But the Fanning friction factors are raised to 107 6-114 93 times of the plain tube levels The thermal performance factors evaluated at constant pumping powers in the range of 1 14-1 04 demonstrate the favorable aerothermal performance of the present HTE method To assist the relevant applications the empirical correlations evaluating the endwall average Nusselt number and Fanning friction factor of the present pin-fin channel are generated based
Date of Award2021
Original languageEnglish
SupervisorShyy-Woei Chang (Supervisor)

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