Computer program, STADDIG, is based on steady state, one dimensional heat transfer calculation using cylindrical coordinates. Program allows for conduction across gas and container walls. Heat is dissipated from walls by forced convection cooling with incompressible coolant. Heat sources are included in coolant, gas, and walls

Davison, H. W.

English

NASA Technical Reports Server

October 1971	 Brief 71-10398 
NASA TECH BRIEF 
Lewis Research Center	
-4:v 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the. Tech Brief program may 
be directed to the Technology Utilization Off i ce, NASA, Code KT, Washington, D. f. 20546. 
Steady Temperature and Density Distributions

in a Gas Containing Heat Sources 
A digital computer program, STADDIG, calculates 
axial temperature and density distributions in a 
stagnant gas containing heat sources and contained 
within an annulus. In a nuclear reactor, when a neu-
tron-absorbing gas is exposed to a neutron flux, 
the spatial distribution of the mass of gas (gas 
density) must be known because of its influence on 
the spatial distribution of neutrons and the resulting 
effects on reactor criticality.
taming 20 axial increments requires about 4 seconds 
of running time when the gas densities and thermal 
conductivities are required to converge within 0.1 and 
I %, respectively. Changing the convergence re-
quirements has no appreciable influence on the prob-
lem running time. 
Notes: 
1. This program is written in FORTRAN IV for 
use on the IBM-7094 computer. 
2. Requests for further information may be directed 
to:
COSMIC 
112 Barrow Hall 
University of Georgia 
Athens, Georgia 30601 
Reference: B71-10398 
Patent status: 
No patent action is contemplated by NASA. 
Source: H. W. Davison 
Lewis Research Center 
(LEW- 10905) 
. The program is based on a steady-state, one-
dimensional (radial) heat-transfer calculation using 
cylindrical coordinates. The gas density is related 
to the gas temperature through the perfect gas law. 
The program allows for conduction across the gas 
and across the container walls. Heat is dissipated 
from the container walls by forced-convection cool-
ing with an incompressible coolant. Heat sources 
are included in the coolant, the gas, and the container 
walls. 
The axial distribution of gas temperature and 
density is determined by successive radial heat-trans-
fer calculations at different axial positions. Axial 
heat conduction is neglected. A typical problem con-
Category 09 
This document was prepared under the sponsorship of the National	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States	 will be free from privately owned rights.
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Steady temperature and density distributions in a gas containing heat sources

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