Effects of Backfill on Heat Transfer From a Buried Pipe

[+] Author and Article Information
C. C. Ngo, F. C. Lai

School of Aerospace and Mechanical Engineering,  University of Oklahoma, Norman, OK 73019

J. Heat Transfer 127(7), 780-784 (Oct 21, 2004) (5 pages) doi:10.1115/1.1924631 History: Received February 12, 2004; Revised October 21, 2004

Natural convection from a buried pipe with a layer of backfill is numerically examined in this study. The objective of the present study is to investigate how a step change in the permeability of the backfill would affect the flow patterns and heat transfer results. Numerical calculations have covered a wide range of the governing parameters (i.e., 10Ra1500 and 0.1K1K210) for various backfill thicknesses (0.5tri2). The results suggest that a more permeable backfill can minimize the heat loss and confine the flow to a region close to the pipe.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

A horizontal pipe embedded in a semi-infinite porous medium

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Figure 2

Computational mesh for the present study

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Figure 3

Flow and temperature fields for a pipe buried in a homogeneous porous medium (ΔΨ=1 and ΔΘ=0.1)

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Figure 4

Flow fields for a buried pipe with a backfill of K1∕K2=10(ΔΨ=0.5)

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Figure 5

Temperature fields for a buried pipe with a backfill of K1∕K2=10(ΔΘ=0.1)

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Figure 6

Flow fields for a buried pipe with a backfill of K1∕K2=0.1(ΔΨ=2)

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Figure 7

Temperature fields for a buried pipe with a backfill of K1∕K2=0.1(ΔΘ=0.1)

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Figure 8

Heat transfer results for natural convection from a buried pipe with and without backfill



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