Heat Transfer Enhancement in a Tube Fitted with Rotary Twisted Tape Inserts
Author(s):
Mr. Shyam S. Darewar, Dr. Vinayak M. Kale
Keywords:
Heat transfer enhancement, Rotary twisted tape inserts Nusselt number, pressure drop, heat transfer enhancement efficiency, swirl flow.
Abstract
This paper represents experimental investigation of heat transfer enhancement by using rotary twisted tape inserts. An Aluminium twisted tape of three different twist ratios (y= 3.0, 4.0 and 5.0) was used for the experimentation. The effect of fixed and rotary twisted tapes on heat transfer enhancements and Pressure drop was studied. The experiment was performed by using copper pipe of 800mm length having 35mm inside diameter and thickness of 1.5mm. Nichrome wire was wound over a copper pipe to maintain uniform heat flux condition. Outer surface temperatures of the tube were measured at 6 different points of the test section by J-type thermocouples and two thermocouples were inserted inside the pipe at two ends two measure inlet and outlet temperature of the air. The Reynolds number was varied from 35,000 to 45,000. The experimental result shows that for the rotary twisted tape inserts at higher RPM, heat transfer rate increases as compared to fixed twisted tapes. The higher Nusselt number obtained in this experimentation is 2.025times the smooth pipe without inserts.
Article Details
Unique Paper ID: 143456

Publication Volume & Issue: Volume 2, Issue 11

Page(s): 308 - 315
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