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  THE EFFECTS OF THE BACK CLEARANCE SIZE AND THE BALANCE HOLES ON THE BACK CLEARANCE FLOW OF THE CENTRIFUGAL PUMP WITH SEMI-OPEN IMPELLER A Dissertation  by SANG HYUN PARK Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY December 2008 Major Subject: Mechanical Engineering   THE EFFECTS OF THE BACK CLEARANCE SIZE AND THE BALANCE HOLES ON THE BACK CLEARANCE FLOW OF THE CENTRIFUGAL PUMP WITH SEMI-OPEN IMPELLER A Dissertation  by SANG HYUN PARK Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Approved by: Chair of Committee, Gerald L. Morrison   Committee Members, Je Chin Han  N. K. Anand Robert Randall Head of Department, Dennis L. O’Neal December 2008 Major Subject: Mechanical Engineering   iiiABSTRACT The Effects of the Back Clearance Size and the Balance Holes on the Back Clearance Flow of the Centrifugal Pump with Semi-Open Impeller. (December 2008) Sang Hyun Park, B.S., Yonsei University, Korea; M.S., Texas A&M University Chair of Advisory Committee: Dr. Gerald Morrison Conventionally the size of the back clearance played a great importance on reducing the axial clearance by utilizing the concept that the decreased axial clearance results in lower axial force acting on the impeller. However, from the previous works on the effect of the back clearance on the hydrodynamic forces upon the semi-open impeller showed the opposite trend: increasing the back clearance results in the reduced axial loading. In this work, the computational fluid dynamics (CFD) simulation of an entire pump and detailed analysis on the back clearance flow are performed. By utilizing the commercially available software, meshing and CFD simulations are performed. LDA data, unsteady pressure data, and pressure distributions on the housing are used to validate the CFD model. The flow field prediction of the back clearance flow is then compared with other researcher’s works of the gap flow analysis  between the rotating and stationary disks. The flow field inside the impeller passage, which is very sensitive to the back clearance size, is also studied. The empirical equation for the leakage loss through the balance holes is produced using the CFD  predictions.   iv   DEDICATION To my loving parents and my lovely wife
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