Author : Kaustubh G. Kulkarni and Mandar M. Lele

Present Experimental work shows result obtain from experimentation of heat transfer enhancement in circular horizontal tube by using wavy clockwise and anticlockwise Copper twist tape inserts with working fluid is air. Experiments conducted on plain circular tube with or without tapes. During experimentation constant heat flux and different mass flow rate condition is used. The wavy clockwise and anticlockwise twist direction tape are of same pitch , varying wave width and different angle of rotation in clockwise and counter clockwise direction as 30°, 45°, 60° respectively. The Reynolds no. varied from 4000 to 11000. Heat transfer coefficient and pressure drop are calculated and results are compared with the plain tube without inserts. Finally heat transfer rate enhances with wavy clockwise and anticlockwise twist direction tape inserts as compared to plain tube varied from 12 % to 56 % with reasonable increment in pressure drop for various inserts. Plain twist tape results are also compared with the same results.

Keywords: Wavy clockwise and anti clockwise twist direction tape insert, twist ratio, wave width, Heat transfer Enhancement, Reynolds number.