Analysis of flow, heat and mass transfer in porous insulations
In this dissertation, a systematic study of heat and mass transfer with phase change in porous insulations has been performed. This was done by investigating three inter-related problems. These problems are modelled by a set of transient inter-coupled governing equations associated with appropriate boundary conditions. The solution algorithm which consists of a two-phase format allows full simulation without any significant simplifications. The present analysis can be applied to a general class of problems on heat and mass transport with phase change through a porous medium. In the first problem a fundamental investigation was conducted on a two-dimensional porous insulation. The horizontal boundaries are insulated and impermeable while the vertical boundaries are permeable and exposed to two different environments, a hot and humid environment on the left-hand side and a cooler environment on the right-hand side. The variations and the interrelationship between the pertinent field variables are discussed in detail. It was found that increasing the humidity level enhanced the condensation rate, vapor transport and the thermal penetration. It was also found that one-dimensional model would lead to errors especially in the mid-region of the insulations. The second and the third problems deal with air infiltration and condensation effects on heat and mass transfer in a porous insulation matrix. The vertical boundaries of the porous system are partially impermeable for simulating the holes or cracks in walls of the buildings. Convective boundary conditions are imposed on the vertical boundaries. In particular for the third problem, hydrostatic pressure variations are considered. The interactions of the field variables and the influence of the Biot numbers and the opening size were investigated.
- Research Organization:
- Ohio State Univ., Columbus, OH (USA)
- OSTI ID:
- 5885065
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
POROUS MATERIALS
HEAT TRANSFER
MASS TRANSFER
THERMAL INSULATION
AIR INFILTRATION
ALGORITHMS
BOUNDARY CONDITIONS
BUILDINGS
CRACKS
ENVIRONMENT
HEAT LOSSES
HUMIDITY
MATHEMATICAL MODELS
PERMEABILITY
SIZE
ENERGY LOSSES
ENERGY TRANSFER
LOSSES
MATERIALS
MATHEMATICAL LOGIC
320107* - Energy Conservation
Consumption
& Utilization- Building Systems- (1987-)
420400 - Engineering- Heat Transfer & Fluid Flow