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Numerical calculations of natural convection on inclined isothermal plate by solving Navier-stokes equations

Conference · · Am. Soc. Mech. Eng., (Pap.); (United States)
OSTI ID:6780465
;

A key component in an open-cycle solar absorption refrigeration system is the solar collector/regenerator that regenerates the weak absorbent solution. The collector/regenerator can be an open flat-plate solar collector over which the absorbent flows in a thin film. The solution starts at the top as a weak absorbent. Water vapor is driven off the solution as it flows over the collector. This re-generates the solution so that a strong solution flows off the bottom of the collector. This paper reports on progress to develop an analytic model for the open-flow collector/ regenerator. The flow and heat transfer for laminar free convection about an inclined isothermal plate are studied by means of finite-difference solutions to the Navier-Stokes equations for incompressible flow and a wide range of angles of inclination. The two end boundaries are set right at the two edges of the plate and a time-dependent method is used to calculate the boundary conditions at the three free boundaries by assuming that the entrained flow is irrotational. The results for air at a Grashof number of 4.2X10/sup 7/ are presented. Good agreement is found between the present solution and experimental data.

Research Organization:
Solar Energy Research Laboratory, Department of Mechanical and Aerospace Engineering, Arizona State University, Tempe, Arizona
OSTI ID:
6780465
Report Number(s):
CONF-831111-
Journal Information:
Am. Soc. Mech. Eng., (Pap.); (United States), Journal Name: Am. Soc. Mech. Eng., (Pap.); (United States) Vol. 83-WA/SOL-10; ISSN ASMSA
Country of Publication:
United States
Language:
English

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Related Subjects

14 SOLAR ENERGY
141000* -- Solar Collectors & Concentrators
ABSORPTION REFRIGERATION CYCLE
BOUNDARY CONDITIONS
CONVECTION
COOLING
DIFFERENTIAL EQUATIONS
ENERGY TRANSFER
EQUATIONS
EQUIPMENT
FLAT PLATE COLLECTORS
FLUID FLOW
HEAT FLOW
HEAT TRANSFER
INCIDENCE ANGLE
INCOMPRESSIBLE FLOW
ISOTHERMAL PROCESSES
MASS TRANSFER
NATURAL CONVECTION
NAVIER-STOKES EQUATIONS
PARTIAL DIFFERENTIAL EQUATIONS
PLATES
REFRIGERATION
REGENERATORS
SOLAR COLLECTORS
SOLAR EQUIPMENT
SOLAR REFRIGERATION
SOLAR REGENERATORS
TIME DEPENDENCE