EXPERIMENTAL STUDY ON HEAT TRANSFER AND FRICTION FACTOR CHARACTERISTICS IN LAMINAR FLOW THROUGH TUBES OF SHELL AND TUBE HEAT EXCHANGER FITTED WITH TWISTED TAPES WITH BAFFLES

A M Mulla, Umesh Jangamashetti, Manoj, Kiran K

Abstract: Present day it is necessary to optimize the heat transfer characteristic of heat exchangers, as heat exchangers are universal equipments which are used in day to day life, in industry, home appliances, transportations and power production units. Thermal characteristics are studied for the tube in the shell and tube heat exchanger working with water as working fluid for two different configurations of twisted tape.1)Typical twisted tapes and 2)twisted tape with baffles (TTWB). Experiment was carried out by using these two types of inserts in the tube side. This paper deals with only laminar flow in the tube side; Re varies from 200 to 600. Experiment carried out by maintaining the constant tube wall temperature with tube flow rate and shell flow constant. Twisted tapes used in this experiment have 2.2 twist ratio, and for baffled twisted tape, baffles are positioned at equal intervals, at an angle 450 with normal axis of twisted tape. The heat transfer and pressure drop in case of twisted tape and twisted tape with baffles are found to increase by 110 to 120% and 130 to 140% respectively than that of plain tube.

Keywords: Shell and tube heat exchanger, twisted tape, twisted tape with baffles, heat transfer coefficient, and pressure drop

DOI: https://doi.org/10.15623/ijret.2014.0305078