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

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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.

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Abbreviations

a :

acceleration (m/s2)

D :

diameter of pipe (m)

g :

gravitational acceleration (m/s2)

Gz :

Graetz number

h x :

local heat transfer coefficient (W/m2 °C)

k :

thermal conductivity (W/m °C)

L:

length of the tube (m)

Nu m,os :

mean Nusselt number under oscillating conditions

Nu m,s :

mean Nusselt number at steady state

Nu x :

local Nusselt number

Nu x,os :

local Nusselt number under oscillating conditions

Nu x,s :

local Nusselt number at steady state

Pr:

Prandtl number

q :

heat flux (W/m2)

Re:

Reynolds number

T bx :

bulk liquid temperature (°C)

T wx :

tube wall temperature (°C)

Q :

volumetric flow rate (m3/s)

\( \overline{{\Delta Q}} \) :

magnitude of variation in flow rate (m3/s)

x :

axial distance (m)

ω :

frequency (radians/s)

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Authors and Affiliations

  1. Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai, 600036, Tamil Nadu, India

    Rajashekhar Pendyala, Sreenivas Jayanti & A. R. Balakrishnan

Authors
  1. Rajashekhar Pendyala
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  2. Sreenivas Jayanti
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  3. A. R. Balakrishnan
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Correspondence to A. R. Balakrishnan.

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Pendyala, R., Jayanti, S. & Balakrishnan, A.R. Convective heat transfer in single-phase flow in a vertical tube subjected to axial low frequency oscillations. Heat Mass Transfer 44, 857–864 (2008). https://doi.org/10.1007/s00231-007-0302-3

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  • DOI: https://doi.org/10.1007/s00231-007-0302-3

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