Experimental studies on effect of bonding the twisted tape with pins to the inner surface of the circular tube

Abstract

Heat transfer and friction factor characteristics are studied for water flowing through the tube in tube heat exchanger for two different configurations, namely,(1) twisted tape with pins and (2) twisted tape with pins bonded to the inner surface of the test section. Experiments are carried out for different twist pitch to the width of the twisted tape ratios (y/w) for both configurations. But very few research works have been done based on the mentioned heat transfer enhancement techniques. This paper presents the effect of twisted tape with pins on the heat transfer for a fully developed turbulent flow. Experiments are conducted by maintaining constant wall temperature. The heat transfer rate and pressure drop is found to be high for configuration (2) of y/w=3.33 when compared to all other configurations. The empirical correlations developed for different twisted tape with pins results in ±7.28% deviation for Nusselt number and ±7.16% for friction factor.

Mathematical model of the intensification of convective heat transfer in a bundle of smooth pipes using petal turbulators

“…The maximum increase in the heat-transfer rate and the coefficient of friction was about 4.2 and 110 times compared to a conventional tube for the investigated range. Selvam et al (2013) conducted experiments on different twisting steps along the width of the twisted tape, and the ratio (y/w is the twist coefficient) for the propeller. A variation of the Nusselt number with the Reynolds number for a pipe equipped with a propeller with three different ratios.…”

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

“…Due to decrease in the area of flow there is increase in flow velocity and turbulence mixing, which results in increase in heat transfer coefficient and pressure drop. S.Selvam et al [2] performed Experimental investigations of heat transfer and friction factor characteristics of a circular tube fitted with full-length twisted tape with pins of different twist ratios have been studied in tube in tube heat exchangers for the turbulent flow of Re ranging between 10000 to 23 000. Author suggested that use of bonded twisted tape with pins in the tube in tube heat exchanger enhances the heat transfer with significant pressure drop.…”

Heat Transfer Enhancement Using Different Geometry of Twist Tape Turbulators: A Review

“…S. Selvam et al [23] carried on experiments for different twist pitch to the width of the twisted tape ratios (y/w) for TTP and TTPB. The variation of Nusselt number with Reynolds number for the tube fitted with TTP of three different y/w ratios (3.33, 4.29, and 5.71).…”