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Convective heat transfer in single-phase flow in a vertical tube subjected to axial low frequency oscillations

Pendyala, Rajashekhar and Jayanti, Sreenivas and A R, Balakrishnan (2008) Convective heat transfer in single-phase flow in a vertical tube subjected to axial low frequency oscillations. Heat Mass Transfer .

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Abstract

The effect of oscillations on the heat transfer in a vertical tube has been studied experimentally. A vertical tube was mounted on a plate and the whole plate was subjected to oscillations in the vertical plane using a mechanical oscillator to provide low frequency oscillations. A section of the tube in the middle is subjected to a constant heat flux. The effect of the oscillations on the heat transfer coefficient has been examined. It was found that the heat transfer coefficient increased with oscillations in the laminar regime. In turbulent flow regime (Re > 2,100) it is found that the effect of oscillations did not show any change. A correlation has been developed for enhancement of the local Nusselt number in terms of the effective acceleration and Reynolds number. Using this, an expression has been proposed to calculate the mean Nusselt number as a function of the tube length.

Item Type:Article
Subjects:T Technology > T Technology (General)
T Technology > TA Engineering (General). Civil engineering (General)
ID Code:5831
Deposited By: Dr Rajashekhar Pendyala
Deposited On:07 Jul 2011 07:03
Last Modified:19 Jan 2017 08:26

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