Performance characteristics of open-flow liquid desiccant solar collector/regenerator for solar cooling applications. Part I: two dimensional analysis of heat and mass transfer for open flow over rough inclined surfaces
This work presents an analytical approach to simulate the combined heat and mass transfer on the interface between wetted collector surface and ambient air. Emphasis was placed on the development of a mathematical model of turbulent natural convection on an inclined rough plate. The effect of surface velocity is also considered. The systems of partial differential equations governing fluid motion, heat and mass transfer along an inclined flat plate were formulated in terms of vorticity transport and stream function equations. One-equation model of turbulence was used to compute the turbulent viscosity. The length scale used in this model was expressed algebraically in terms of the mixing length. A length scale modified function was derived to take into account the bouyancy effects on turbulence. The effect of surface roughness was taken into a account by introducing a characteristic roughness length. A computational technique was developed to solve the resulting elliptic partial differential equations. This technique involved an 'inflow-outflow' scheme to determine the free boundary conditions at the leading and trailing edges of the inclined plate. The validity of this computational technique was tested and confirmed by some testing problems. Among these are (1) laminar natural convection on an inclined isothermal plate (2) turbulent natural convection on a vertical isothermal plate and (3) turbulent natural convection on an inclined constant heat flux flat plate.
- Research Organization:
- Arizona State Univ., Tempe (USA). Coll. of Engineering and Applied Sciences
- DOE Contract Number:
- AC03-82SF11691
- OSTI ID:
- 5323490
- Report Number(s):
- ERC-R-83043; ON: DE85014778
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HEAT TRANSFER
TWO-DIMENSIONAL CALCULATIONS
MASS TRANSFER
SOLAR COOLING SYSTEMS
SOLAR COLLECTORS
SOLAR REGENERATORS
PERFORMANCE
ABSORPTION REFRIGERATION CYCLE
BOUNDARY CONDITIONS
DESICCANTS
FLUID FLOW
FORCED CONVECTION
INTERFACES
NATURAL CONVECTION
NUMERICAL SOLUTION
NUSSELT NUMBER
OPEN-CYCLE COOLING SYSTEMS
ROUGHNESS
TEMPERATURE DISTRIBUTION
VELOCITY
CONVECTION
COOLING SYSTEMS
ENERGY SYSTEMS
ENERGY TRANSFER
EQUIPMENT
REGENERATORS
SOLAR EQUIPMENT
SURFACE PROPERTIES
140901* - Solar Thermal Utilization- Space Heating & Cooling