Thermal performance and frictional losses study of solid hollow circular disc with rectangular wings in circular tube

In this research the thermal properties for solid hollow circular disc with rectangular wings in circular pipe heat exchanger tube are analysed. Taking constant heat flux and steady state conditions, the investigation of the heat transfer, friction factor and thermal performance of the tube is done. The different parameters diameter ratio (DR = 0.8 and 0.9), blockage ratio (BR = 0.1 and 0.05), pitch ratio (PR = 2 and 3) and wings attack angle (θ = 15° and 30°) on heat transfer coefficient have been considered for the research. The working fluid is air at Reynolds number varying from 7000 to 32,000. Experimental results shows that heat transfer was improved 3.47 times for case DR = 0.8, BR = 0.1, PR = 2 and θ = 15° over plain tube. The highest thermal performance factor found is 1.95 at DR = 0.9, BR = 0.05, PR = 3, θ = 15°.