Showing 2 results for A. A. Bidokhti
A. A. Bidokhti and A. R. Mohamadnejad,
Volume 16, Issue 1 (7-1997)
Abstract
A small salt gradient solar pond with an average surface area of 1.8 m2 and depth of 0.8m has been tested. The depths of storage, gradient and surface zones are 0.3, 0.27 and 0.07m, respectively. The temperature of the storage zone for the summer days reaches its maximum of 65˚ C after about 8 days. Daily variation of the storage zone temperature was about 8˚C which is due to small volume of this zone. The thermal absorption of the pond varies between 35 to 20 percent of the total solar radiation, depending on the temperature of the storage zone. Salinity of the storage zone is about 200 gr/kg and the density gradient of the gradient zone is about 5x10-3 gr/cm4 which with typical fluid velocity of the convective zone gives a Richardson number, Ri, of order of 104. Erosion of the gradient zone based on this Ri is about 2.5 cm/month which is in agreement with the observations. Although the temperature of the storage zone reaches high values, with sloped wall, no sign of double diffusive convection was observed.
M.r. Bannazadeh, A. A. Bidokhti, M. Kherandish and H. F. Hosseini,
Volume 21, Issue 1 (7-2002)
Abstract
Observations of the Caspian Sea during August-September 1995 are used to develop a three-dimensional numerical model to be used in calculating temperature and current. The model has variable grid resolution and horizontal smoothing that filters out small scale vertical motion. Data from the meteorological buoy network on the Caspian Sea are combined with routine observations at first-order synoptic station around the lake to obtain hourly values of wind stress and pressure fields. The hydrodynamic model of the Caspian Sea has 6 vertical levels and a uniform horizontal grid size of 50 km. The model is driven with surface fluxes of heat and momentum derived from observed meteorological data. The model was able to reproduce all the basic features of the thermal structure in the Caspian Sea and larger-scale circulation patterns tended to be anticyclone, with anticyclone circulation within each sub-basin. The results matched observation data.
Keywords: Circulation, Temperature, Numerical model, Vorticity, wind stress
