Numerical modeling of a solid particle solar central receiver
The flow of air and particles and the heat transfer inside a solar heated, open cavity containing a falling cloud of 100 to 1000 micron solid particles have been studied. Two-way momentum and thermal coupling between the particles and the air is included in the analysis along with the effects of radiative transport within the particle cloud, among the cavity surfaces, and between the cloud and the surfaces. The flow field is assumed to be two dimensional with steady mean quantities. The PSI-Cell (particle source in cell) computer code is used to describe the gas-particle interaction. The method of discrete ordinates is used to obtain the radiative transfer within the cloud. The results include the velocity and temperature profiles of the particles and the air. In addition, the thermal performance of the solid particle solar receiver has been determined as a function of the following particle parameters: size, mass flow rate, absorptivity, and infrared scattering albedo. Other parameters which have been varied include the incident solar flux (both magnitude and distribution) and receiver size. A forced flow, applied across the cavity aperture, has also been investigated as a means of decreasing convective heat loss from the cavity. Comparison of the results from the model has been made with an experiment performed at the radiant heat facility in Albuquerque. The model has also been used to predict the entrainment of air and the decrease in particle drag which has been observed when measurements were made of particle velocity in a cloud of particles in free fall.
- Research Organization:
- Sandia National Lab. (SNL-CA), Livermore, CA (United States); California Univ., Berkeley (USA). Dept. of Mechanical Engineering; Washington State Univ., Pullman (USA). Dept. of Mechanical Engineering
- DOE Contract Number:
- AC04-76DR00789
- OSTI ID:
- 6315392
- Report Number(s):
- SAND-85-8249; ON: DE86005066
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CAVITY RECEIVERS
COMPUTERIZED SIMULATION
PARTICLES
ABSORPTIVITY
EFFICIENCY
FLOW MODELS
HEAT FLUX
ISOTHERMS
NUMERICAL SOLUTION
RADIANT HEAT TRANSFER
TEMPERATURE MEASUREMENT
TEST FACILITIES
VELOCITY
ENERGY TRANSFER
HEAT TRANSFER
MATHEMATICAL MODELS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
SIMULATION
SOLAR RECEIVERS
140702* - Solar Thermal Power Systems- Central Receiver