Engineering method of calculation temperature fields and thermal stresses in the initial stage of radiation convection heating (cooling) body with variable heat transfer coefficient, and the temperature of environment
Existing solutions of radiant and convective heating (cooling) body problems at the initial stage at unsteady heat transfer coefficients and temperatures are rather cumbersome. The purpose of this work is getting simpler dependencies. Decisions are based on the analysis of relations between the c...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Academy of Sciences of Moldova
2016-08-01
|
| Series: | Problems of the Regional Energetics |
| Subjects: | |
| Online Access: | http://journal.ie.asm.md/assets/files/08_02_31_2016.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Existing solutions of radiant and convective heating (cooling) body problems at the initial
stage at unsteady heat transfer coefficients and temperatures are rather cumbersome. The purpose of
this work is getting simpler dependencies. Decisions are based on the analysis of relations between the
cause (heat flow) and the effect (surface temperature) in the initial period of heating. Two simple and
effective engineering methods of calculation of unsteady temperature fields, and axial thermal stresses
at the initial stage of heating (cooling) of body of canonical form for both convection and radiation
heat transfer at variable ambient temperature and environmental factors have been developed. Some of
the solutions are generic in nature, which allows significantly reducing the number of variables and
thus using the graphical method of problem solving. The formulas for calculating the bulk and central
temperature in the initial stage are provided; other researchers of nonlinear heat conduction problems
did not usually do this. It has been found that the axial thermal stresses are determined entirely by the
heat flow on the surface. The adequacy of the developed techniques is based on five cases of
calculation of heating (cooling) plates under various conditions of its thermal loading. It is shown that
the error in determining the surface temperature does not exceed 6%, and that the developed method
can be used up to Fourier numbers Fo<0.4 |
|---|---|
| ISSN: | 1857-0070 |