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research-article

Study of Buoyancy Driven Flow effect on Salt Gradient Solar Ponds Performance

[+] Author and Article Information
Shahram Derakhshan

Assistant Professor, Iran university of Science and Technology, Tehran, Iran
shderakhshan@iust.ac.ir

Seyedeh Elnaz Mirazimzadeh

Iran University of Science and Technology, Tehran, Iran
mirazimzadeh.elnaz@gmail.com

Syamak Pazireh

Iran University of Science and Technology, Tehran, Iran
syamak.pazireh@gmail.com

1Corresponding author.

ASME doi:10.1115/1.4040189 History: Received April 25, 2017; Revised April 25, 2018

Abstract

Salt gradient solar ponds are the ponds in which due to existence of saline and salt gradient layers, lower layers are denser and avoid occurring natural convection phenomenon so solar radiation energy can be stored in lowest zone. In this study, 1-dimensional and 2-dimensional numerical approaches have been done to simulate unsteady buoyancy driven flow of solar ponds. In 1D method, the pond has been investigated on its layers height in which variation of temperature is calculated by mass and energy conservation and mass transfer equations. The formulized radiation term was used as energy source term in energy equation. The results of 1D approach were validated with an experimental study and then optimization was carried out to gain height of layers to obtain maximum thermal efficiency. In 2D study, in order to investigate hydrodynamic and thermal behavior of saltwater fluid, a numerical approach was used to simulate temperature and velocity gradients throughout the pond. The results of 2D numerical method are validated with an experimental data. The effective parameters in physic of solar ponds are introduced.

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