NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Transient-forced convection film boiling on an isothermal flat plate.Development of a new approach for the solution of transient-forced convection film boiling on an isothermal flat plate using the boundary layer model. The similarity variables are used to convert the governing partial differential equations to ordinary ones. The results of numerical solutions of these ordinary equations indicate that the transient process can be classified as one-dimensional conduction, intermediate, and the steady-state regions. The time required for the one-dimensional conduction and the time necessary to attain a steady-state condition are obtained. The use of local similarity approximations for the intermediate regime facilitates prediction of complete boundary layer growth. Using the ratio of time at any instant to the steady-state time as abscissa, the curves representing the boundary layer growth can be merged into a single mean curve within 5%. Further, the analysis shows that the average rate of heat transfer during transient is 50 to 100% higher than those at steady state. The average rate of vapor convected away is 10 to 15% lower than at steady state while the average rate of accumulation to form the vapor layer is 1 to 14 times larger.
Document ID
19720041561
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Nagendra, H. R.
(NASA Marshall Space Flight Center Huntsville, Ala., United States)
Date Acquired
August 6, 2013
Publication Date
April 1, 1972
Subject Category
Thermodynamics And Combustion
Report/Patent Number
AIAA PAPER 72-289
Meeting Information
Meeting: American Institute of Aeronautics and Astronautics, Thermophysics Conference
Location: San Antonio, TX
Start Date: April 10, 1972
End Date: April 12, 1972
Sponsors: American Institute of Aeronautics and Astronautics
Accession Number
72A25227
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available