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Title: A thermal mixing model of crossflow in tube bundles for use with the porous body approximation

Abstract

Diffusive thermal mixing in a heated tube bundle with a cooling fluid in crossflow was analyzed numerically. From the results of detailed two-dimensional models, which calculated the diffusion of heat downstream of one heated tube in an otherwise adiabatic flow field, a diffusion model appropriate for use with the porous body method was developed. The model accounts for both molecular and turbulent diffusion of heat by determining the effective thermal conductivity in the porous region. The model was developed for triangular shaped staggered tube bundles with pitch to diameter ratios between 1.10 and 2.00 and for Reynolds numbers between 1,000 and 20,000. The tubes are treated as nonconducting. Air and water were considered as working fluids. The effective thermal conductivity was found to be linearly dependent on the tube Reynolds number and fluid Prandtl number, and dependent on the bundle geometry. The porous body thermal mixing model was then compared against numerical models for flows with multiple heated tubes with very good agreement.

Authors:
 [1];  [2]
  1. Lockheed Martin Corp., Schenectady, NY (United States)
  2. RPI, Troy, NY (United States)
Publication Date:
Research Org.:
Knolls Atomic Power Lab. (KAPL), Niskayuna, NY (United States)
Sponsoring Org.:
USDOE Assistant Secretary for Nuclear Energy, Washington, DC (United States)
OSTI Identifier:
350934
Report Number(s):
KAPL-P-000017; K-95156; CONF-9606420-
ON: DE99002678; TRN: AHC29921%%119
DOE Contract Number:  
AC12-76SN00052
Resource Type:
Conference
Resource Relation:
Conference: International conference on porous media and it`s applications, Kona, HI (United States), 16-21 Jun 1996; Other Information: PBD: Jun 1996
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; CROSSFLOW SYSTEMS; NUMERICAL ANALYSIS; HEAT TRANSFER; TURBULENT FLOW; THERMAL CONDUCTIVITY; MATHEMATICAL MODELS; TEMPERATURE DISTRIBUTION; MIXING

Citation Formats

Ashcroft, J, and Kaminski, D A. A thermal mixing model of crossflow in tube bundles for use with the porous body approximation. United States: N. p., 1996. Web.
Ashcroft, J, & Kaminski, D A. A thermal mixing model of crossflow in tube bundles for use with the porous body approximation. United States.
Ashcroft, J, and Kaminski, D A. 1996. "A thermal mixing model of crossflow in tube bundles for use with the porous body approximation". United States. https://www.osti.gov/servlets/purl/350934.
@article{osti_350934,
title = {A thermal mixing model of crossflow in tube bundles for use with the porous body approximation},
author = {Ashcroft, J and Kaminski, D A},
abstractNote = {Diffusive thermal mixing in a heated tube bundle with a cooling fluid in crossflow was analyzed numerically. From the results of detailed two-dimensional models, which calculated the diffusion of heat downstream of one heated tube in an otherwise adiabatic flow field, a diffusion model appropriate for use with the porous body method was developed. The model accounts for both molecular and turbulent diffusion of heat by determining the effective thermal conductivity in the porous region. The model was developed for triangular shaped staggered tube bundles with pitch to diameter ratios between 1.10 and 2.00 and for Reynolds numbers between 1,000 and 20,000. The tubes are treated as nonconducting. Air and water were considered as working fluids. The effective thermal conductivity was found to be linearly dependent on the tube Reynolds number and fluid Prandtl number, and dependent on the bundle geometry. The porous body thermal mixing model was then compared against numerical models for flows with multiple heated tubes with very good agreement.},
doi = {},
url = {https://www.osti.gov/biblio/350934}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jun 01 00:00:00 EDT 1996},
month = {Sat Jun 01 00:00:00 EDT 1996}
}

Conference:
Other availability
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