Accession Number:

ADA231969

Title:

A Determination/Validation of Autoclave Forced Convection Heating

Descriptive Note:

Final rept.

Corporate Author:

ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB

Report Date:

1990-12-01

Pagination or Media Count:

26.0

Abstract:

The top face of a semi-infinite, plaster of paris slab was heated by forced convection in an autoclave while its depthwise temperature profile was obtained as a function of time by embedded thermocouples. The average forced convection heat transfer parameter of the slabs top face was determined from a time dependent lumped parameter analysis of temperature data acquired from two slug meters of varying design. the resulting nonlinear convective boundary conditions were applied to a transient heat transfer model of the semi-infinite slab to predict depthwise temperature profiles as a function of time. The models thermal property data base was developed using a flash pulse method to determine thermal diffusivity and differential scanning calorimetry DSC to determine specific heat. Model temperatures compared poorly to experimental temperatures using the convective boundary condition obtained from the conventional wood slug meter design. However, a 5 temperature comparison was observed using the convective boundary condition obtained from the hybrid cork fiberglass slug meter design. Finite element heat transfer analysis of the slug meters themselves illustrated the effects of heat retention on slug meter performance.

Subject Categories:

  • Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE