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Title: THERMODYNAMICS OF UNSTEADY FLOW PROCESSES INVOLVING TRANSFER OF HEAT FOR VENTED CONTAINMENT SYSTEMS

Abstract

The first law of thermodynamics for changes of state and quantity of the working substance in the case of unsteady flow is presented. Included are mass balance, forms of energy utilized, and definitions of stagnation enthalpy and stored energy. From the equations for unsteady flow the familiar equations for steady flow are deduced. A special case of the first law of thermodynamics for changes of state and quantity is applied in the theoreticaf derivation on emptying of a vented containment structure having a constant heat source. The appropriate thermodynamic relations necessary for evolvement are stated and a resume on nozzle flow is made. Graphs were plotted for the air temperature, pressure, and mass with respect to time for the constant-pressure and constant- volume processes; for a large vent and a small vent where the same initial pressure is prevalent to the containment structure and atmosphere; and for heating the internal gas to a predetermined pressure and then releasing through a large vent or a small vent. The resultant thermodynamic relations are applied to a hypothetical containment system to illustrate their generality. This hypothetical containment system consists of an extinguishing system, containment structure system, and a venting system. Tables of functionsmore » for various nozzle flow relations are given. The basic first order equation is transformed for use in conjunction with the tables and a desk computer. The essential equations for numerical integration and a numerical example are related. (auth)« less

Authors:
Publication Date:
Research Org.:
Argonne National Lab., Lemont, Ill.
OSTI Identifier:
4223284
Report Number(s):
ANL-5987
NSA Number:
NSA-13-019424
DOE Contract Number:  
W-31-109-ENG-38
Resource Type:
Technical Report
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-59
Country of Publication:
United States
Language:
English
Subject:
PHYSICS AND MATHEMATICS; AIR; DIAGRAMS; ENERGY; ENTHALPY; EQUATIONS; GAS FLOW; HEAT TRANSFER; HEATING; MASS; NOZZLES; NUMERICALS; PRESSURE; TABLES; TEMPERATURE; THERMODYNAMICS; VOLUME

Citation Formats

Heap, J.C. THERMODYNAMICS OF UNSTEADY FLOW PROCESSES INVOLVING TRANSFER OF HEAT FOR VENTED CONTAINMENT SYSTEMS. United States: N. p., 1959. Web. doi:10.2172/4223284.
Heap, J.C. THERMODYNAMICS OF UNSTEADY FLOW PROCESSES INVOLVING TRANSFER OF HEAT FOR VENTED CONTAINMENT SYSTEMS. United States. doi:10.2172/4223284.
Heap, J.C. Wed . "THERMODYNAMICS OF UNSTEADY FLOW PROCESSES INVOLVING TRANSFER OF HEAT FOR VENTED CONTAINMENT SYSTEMS". United States. doi:10.2172/4223284. https://www.osti.gov/servlets/purl/4223284.
@article{osti_4223284,
title = {THERMODYNAMICS OF UNSTEADY FLOW PROCESSES INVOLVING TRANSFER OF HEAT FOR VENTED CONTAINMENT SYSTEMS},
author = {Heap, J.C.},
abstractNote = {The first law of thermodynamics for changes of state and quantity of the working substance in the case of unsteady flow is presented. Included are mass balance, forms of energy utilized, and definitions of stagnation enthalpy and stored energy. From the equations for unsteady flow the familiar equations for steady flow are deduced. A special case of the first law of thermodynamics for changes of state and quantity is applied in the theoreticaf derivation on emptying of a vented containment structure having a constant heat source. The appropriate thermodynamic relations necessary for evolvement are stated and a resume on nozzle flow is made. Graphs were plotted for the air temperature, pressure, and mass with respect to time for the constant-pressure and constant- volume processes; for a large vent and a small vent where the same initial pressure is prevalent to the containment structure and atmosphere; and for heating the internal gas to a predetermined pressure and then releasing through a large vent or a small vent. The resultant thermodynamic relations are applied to a hypothetical containment system to illustrate their generality. This hypothetical containment system consists of an extinguishing system, containment structure system, and a venting system. Tables of functions for various nozzle flow relations are given. The basic first order equation is transformed for use in conjunction with the tables and a desk computer. The essential equations for numerical integration and a numerical example are related. (auth)},
doi = {10.2172/4223284},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1959},
month = {7}
}