文档介绍：NASA
CR
3595
NASA Conmctor Report 3595
A Frost Formation Model and
Its Validation Under Various
Experimental Conditions
Mark A. Dietenberger
CONTRACT NASS-33369
AUGUST 1982
I
TECH LIBRARY KAFB. NM
NASA Contmctor Rept 3595
A Frost Formation Model and
Its Validation Under Various
Experimental Conditions
Mark A. Dietenberger
Univekty o Dayton
Dayton, 0 d io
Prepared for
Ma&all Space Flight Center
under Contract NASS-33369
National Aeronautics
and Space Administration
Scientific and Technical
Information Branch
1982
- -1
ACKNOWLEDGEMENT
This research was ,sponsored by the National Aeronautics and
Space Administration, Marshall Space Flight Center, Space
Sciences Laboratory, Atmospheric Sciences Division, under
Contract NAS8-33369. The author is indebted to Mr. A. Richard
Tobiason of the Office of Aeronautics and Space Technology, NASA
Headquarters for support of this research and Mr. Dennis Camp of
Marshall Space Flight Center for his assistance as Technical
Monitor.
iii
TABLE OF CONTENTS
Section Page
1. Introduction 1
2 The Frost Initiation Model 7
3 The Frost Formation Model 10
parison to Experimental Data 14
Turbulent Forced Convection in a Duct 14
Laminar and Turbulent Natural Convection 31
on a Vertical Plate
Laminar Forced Convection on a Cylinder 38
Laminar and Turbulent Forced Convection 41
on a Flat Plate
5 Conclusion 47
Appendix
I Boundary Layer Fogging 48
II Frost Thermal Conductivity 50
III Solution of Boundary-Layer Equations for Free 52
Convection Turbulent Flow
References 56
iv
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LIST OF ILLUSTRATIONS
Figure Page
1 Correlation of the Experimental Nusselt's 16
Number Containing the Heat Transfer
Coefficient, hH, versus Reynolds Number.
2 Correlation of*the Experimental Heat Transfer 18
Coefficient, hH, versus,the Experimental Mass
Transfer Coefficient, hm. (Data