EFFECT OF WATER PROPERTIES DISTRIBUTION IN TIGRIS RIVER DOWNSTREAM OF AL-DAURA POWER STATION

Hashaim AL- Sahelly, Raafa; Jasam Nasar, Mahasan

	EFFECT OF WATER PROPERTIES DISTRIBUTION IN TIGRIS RIVER DOWNSTREAM OF AL-DAURA POWER STATION
AL-TAQANI
Article 1, Volume 21, Issue 4, 2008, Pages 61-71
Authors
Raafa Hashaim AL- sahelly; Mahasan Jasam Nasar
Abstract
This research aims to study the effect of water properties (such as density and viscosity ) and heated water temperature on temperature distribution in Tigris river downstream Al-Duara power station . For this purpose a numerical model is applied for estimating temperature diffusion and distribution in river . Momentum and energy conservation equations are used to describe the temperature distribution along the study area . The model incorporates the (K-ε) turbulence model to calculate the distribution of turbulent viscosity. The pressure distribution was determined using hydrostatic pressure equation . The partial differential equations were simplified to obtain the system of linear equations which were then solved using Gauss- Elimination method . The numerical model is verified by the comparison of observed data from AL-Daura power station with those computed by the model .The comparison results show agreement with maximum absolute difference of (18%) and correlation coefficient of (0.925). The results show that neglecting the effect of density difference causes a longitudinal and vertical retardation of isotherms of about (12.5% and 50%), respectively. Assumption of constant viscosity causesa longitudinal and vertical retardation of isotherms about (10% and 60%) , respectively . Increasing the heated water temperature from 40 ˚C to 60 ˚C causes a longitudinal advance of isotherms of about (32%)

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