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Record Details

Record 23 of 30409
ELM - A SIMPLE TOOL FOR THERMAL-HYDRAULIC ANALYSIS OF SOLID-CORE NUCLEAR ROCKET FUEL ELEMENTS
Author and Affiliation:
Walton, J. T.
Abstract: ELM is a simple computational tool for modeling the steady-state thermal-hydraulics of propellant flow through fuel element coolant channels in nuclear thermal rockets. Written for the nuclear propulsion project of the Space Exploration Initiative, ELM evaluates the various heat transfer coefficient and friction factor correlations available for turbulent pipe flow with heat addition. In the past, these correlations were found in different reactor analysis codes, but now comparisons are possible within one program. The logic of ELM is based on the one-dimensional conservation of energy in combination with Newton's Law of Cooling to determine the bulk flow temperature and the wall temperature across a control volume. Since the control volume is an incremental length of tube, the corresponding pressure drop is determined by application of the Law of Conservation of Momentum. The size, speed, and accuracy of ELM make it a simple tool for use in fuel element parametric studies. ELM is a machine independent program written in FORTRAN 77. It has been successfully compiled on an IBM PC compatible running MS-DOS using Lahey FORTRAN 77, a DEC VAX series computer running VMS, and a Sun4 series computer running SunOS UNIX. ELM requires 565K of RAM under SunOS 4.1, 360K of RAM under VMS 5.4, and 406K of RAM under MS-DOS. Because this program is machine independent, no executable is provided on the distribution media. The standard distribution medium for ELM is one 5.25 inch 360K MS-DOS format diskette. ELM was developed in 1991. DEC, VAX, and VMS are trademarks of Digital Equipment Corporation. Sun4 and SunOS are trademarks of Sun Microsystems, Inc. IBM PC is a registered trademark of International Business Machines. MS-DOS is a registered trademark of Microsoft Corporation.
Publication Date: Jan 01, 1994
Document ID:
19940002956
(Acquired Dec 28, 1995)
Accession Number: 94M10499
Subject Category: FLUID MECHANICS AND HEAT TRANSFER
Report/Patent Number: LEW-15423
Document Type: Computer Program
Publisher Information: United States
Financial Sponsor: NASA Lewis Research Center
Description: In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: AXIAL FLOW; ELM; HEAT TRANSFER; NUCLEAR PROPULSION; PERFORMANCE PREDICTION; TEMPERATURE MEASUREMENT; THERMOHYDRAULICS
Other Descriptors: FORTRAN 77; MACHINE INDEPENDENT
Miscellaneous Notes: Approximately 3,570 source statements
Availability Source: Other Sources
Availability Notes: Program $480.00
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