MUHAMMED HASHID - Academia.edu (original) (raw)
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Universidad Autonoma de Baja California Sur (UABCS)
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Papers by MUHAMMED HASHID
Journal of Hydraulic Research, 2020
Formation of an air-entraining vortex in the vicinity of an intake structure is considered to be ... more Formation of an air-entraining vortex in the vicinity of an intake structure is considered to be a major problem of the intake. These vortices are not acceptable as they decrease the efficiency of the intake structures. Adequate submergence above the intake can effectively halt the formation of such vortices. The present study deals with the analytical and experimental works carried out on a horizontal side circular intake with and without bellmouth transitions in an open channel flow. The parameters affecting the critical submergence of intakes have been identified and relevant parameters have been used to develop relationships for the critical submergence of the side circular intakes. The accuracy of the proposed relationships is well within the acceptable limit. The results of the present study can be utilized by field engineers and practitioners for the rational design of side intakes used for diverting flow without the formation of air-entraining vortices.
Estimation of the critical submergence for water intakes is important for avoiding air-entrainmen... more Estimation of the critical submergence for water intakes is important for avoiding air-entrainment from free surface vortices. Critical submergence can be defined as the minimum submergence required for a water intake for preventing the entry of air core of free surface vortex causing air entrainment. The present paper discusses an experimental study on the critical submergence for dual water intakes placed laterally on the side wall of an open channel under uniform flow conditions. The parameters that likely affect the critical submergence of dual intakes are identified and discussed. Intake Froude number and the approach flow Froude number are found to be the most significant parameters that affect the vortex formation at the dual intakes. Velocity field at the vicinity of the intakes were measured using Acoustic Doppler Velocimeter (ADV).Vortex formation was observed at downstream intake at critical submergence when both intakes carried same discharge. Flow at dual intakes at critical submergence was simulated using a Three Dimensional Multiphase CFD model. The size and form of the air-entraining vortex from CFD simulations were identified using volume fraction analysis. Volume fraction study was used to identify the critical submergence. The results obtained from CFD results were validated using experimental data and found to be in good agreement. The results obtained from the present paper may highly benefit the hydraulic engineers for the rational design of water intakes.
Intakes are widely used for flow diversion and its control in the open channels. Circular intakes... more Intakes are widely used for flow diversion and its control in the open channels. Circular intakes with bellmouth transitions are used to enhance the discharging capacity of the intakes. Analytical and experimental studies for flow through lateral circular intakes with and without bellmouth in open channels are presented in this paper. This study indicates that the coefficient of discharge for the lateral intake under uniform flow is dependent on the Froude number of the approach flow in the main channel and the ratio of width of the orifice to the width of the main channel. Collected data in this study are used to develop regression equation for the coefficient of discharge. The computed discharges using the proposed equations in this study are within ±10% and ±7% of the observed ones for intake with and without bellmouth, respectively. The discharging capacity of an intake with bellmouth is higher than the intake without transition. Sensitivity analysis indicates that the discharge...
Journal of Hydraulic Research, 2020
Formation of an air-entraining vortex in the vicinity of an intake structure is considered to be ... more Formation of an air-entraining vortex in the vicinity of an intake structure is considered to be a major problem of the intake. These vortices are not acceptable as they decrease the efficiency of the intake structures. Adequate submergence above the intake can effectively halt the formation of such vortices. The present study deals with the analytical and experimental works carried out on a horizontal side circular intake with and without bellmouth transitions in an open channel flow. The parameters affecting the critical submergence of intakes have been identified and relevant parameters have been used to develop relationships for the critical submergence of the side circular intakes. The accuracy of the proposed relationships is well within the acceptable limit. The results of the present study can be utilized by field engineers and practitioners for the rational design of side intakes used for diverting flow without the formation of air-entraining vortices.
Journal of Hydraulic Research, 2020
Formation of an air-entraining vortex in the vicinity of an intake structure is considered to be ... more Formation of an air-entraining vortex in the vicinity of an intake structure is considered to be a major problem of the intake. These vortices are not acceptable as they decrease the efficiency of the intake structures. Adequate submergence above the intake can effectively halt the formation of such vortices. The present study deals with the analytical and experimental works carried out on a horizontal side circular intake with and without bellmouth transitions in an open channel flow. The parameters affecting the critical submergence of intakes have been identified and relevant parameters have been used to develop relationships for the critical submergence of the side circular intakes. The accuracy of the proposed relationships is well within the acceptable limit. The results of the present study can be utilized by field engineers and practitioners for the rational design of side intakes used for diverting flow without the formation of air-entraining vortices.
Estimation of the critical submergence for water intakes is important for avoiding air-entrainmen... more Estimation of the critical submergence for water intakes is important for avoiding air-entrainment from free surface vortices. Critical submergence can be defined as the minimum submergence required for a water intake for preventing the entry of air core of free surface vortex causing air entrainment. The present paper discusses an experimental study on the critical submergence for dual water intakes placed laterally on the side wall of an open channel under uniform flow conditions. The parameters that likely affect the critical submergence of dual intakes are identified and discussed. Intake Froude number and the approach flow Froude number are found to be the most significant parameters that affect the vortex formation at the dual intakes. Velocity field at the vicinity of the intakes were measured using Acoustic Doppler Velocimeter (ADV).Vortex formation was observed at downstream intake at critical submergence when both intakes carried same discharge. Flow at dual intakes at critical submergence was simulated using a Three Dimensional Multiphase CFD model. The size and form of the air-entraining vortex from CFD simulations were identified using volume fraction analysis. Volume fraction study was used to identify the critical submergence. The results obtained from CFD results were validated using experimental data and found to be in good agreement. The results obtained from the present paper may highly benefit the hydraulic engineers for the rational design of water intakes.
Intakes are widely used for flow diversion and its control in the open channels. Circular intakes... more Intakes are widely used for flow diversion and its control in the open channels. Circular intakes with bellmouth transitions are used to enhance the discharging capacity of the intakes. Analytical and experimental studies for flow through lateral circular intakes with and without bellmouth in open channels are presented in this paper. This study indicates that the coefficient of discharge for the lateral intake under uniform flow is dependent on the Froude number of the approach flow in the main channel and the ratio of width of the orifice to the width of the main channel. Collected data in this study are used to develop regression equation for the coefficient of discharge. The computed discharges using the proposed equations in this study are within ±10% and ±7% of the observed ones for intake with and without bellmouth, respectively. The discharging capacity of an intake with bellmouth is higher than the intake without transition. Sensitivity analysis indicates that the discharge...
Journal of Hydraulic Research, 2020
Formation of an air-entraining vortex in the vicinity of an intake structure is considered to be ... more Formation of an air-entraining vortex in the vicinity of an intake structure is considered to be a major problem of the intake. These vortices are not acceptable as they decrease the efficiency of the intake structures. Adequate submergence above the intake can effectively halt the formation of such vortices. The present study deals with the analytical and experimental works carried out on a horizontal side circular intake with and without bellmouth transitions in an open channel flow. The parameters affecting the critical submergence of intakes have been identified and relevant parameters have been used to develop relationships for the critical submergence of the side circular intakes. The accuracy of the proposed relationships is well within the acceptable limit. The results of the present study can be utilized by field engineers and practitioners for the rational design of side intakes used for diverting flow without the formation of air-entraining vortices.