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STUDY OF TRANSIENT BEHAVIOR OF THE EVAPORATOR OF THE MICRO LOOP HEAT PIPE AND MODIFICATIONS TO THE EXISTING GLOBAL MODEL

PONUGOTI, PRIYANKA

Abstract Details

2006, MS, University of Cincinnati, Engineering : Mechanical Engineering.
The Micro Loop Heat Pipe (ìLHP) is a self-circulating cooling device with extremely high thermal conductivity where heat is removed by phase change and the working fluid circulates by means of the thermodynamic pressure difference developed between evaporator and condenser. Theoretical steady state models have been developed to explain the effect of different parameters on the performance of the ìLHP that utilizes a Coherent Porous Silicon (CPS) wick. The evaporator package being huge thermal mass, the time required to reach steady-state is large. In this study, the planar evaporator component was analyzed to study the behavior of LHP’s during the transient state. Two-dimensional transient state analysis was performed on the evaporator component of the LHP with necessary boundary conditions using Ansys 9.0. Analysis was performed in two steps with change in the boundary conditions on the surface of the silicon wick. In the first step, the surface of the wick was assumed to be adiabatic until it reached 700C where it was assumed to be evaporating. Evaporating boundary condition was then applied on the surface of the wick, which constituted the second step. It is analyzed for different values of ‘h’ ranging from 0.45 W/m2K to 4500 W/m2K to study the effect of convection cooling. The existing steady-state model developed at University of Cincinnati uses saturation temperature and pressure in the condenser as the independent parameters which is an ideal assumption. To modify the model, as a first step, the present generation condenser, shell and tube heat exchanger was designed and over-all heat transfer coefficient was determined. The new global model was then developed by rewriting the closure equations to be dependent on the new real independent parameters mass and temperature of the inlet cooling water in the condenser.
Dr. Frank Gerner (Advisor)
86 p.

Recommended Citations

Citations

  • PONUGOTI, P. (2006). STUDY OF TRANSIENT BEHAVIOR OF THE EVAPORATOR OF THE MICRO LOOP HEAT PIPE AND MODIFICATIONS TO THE EXISTING GLOBAL MODEL [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1152120818

    APA Style (7th edition)

  • PONUGOTI, PRIYANKA. STUDY OF TRANSIENT BEHAVIOR OF THE EVAPORATOR OF THE MICRO LOOP HEAT PIPE AND MODIFICATIONS TO THE EXISTING GLOBAL MODEL. 2006. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1152120818.

    MLA Style (8th edition)

  • PONUGOTI, PRIYANKA. "STUDY OF TRANSIENT BEHAVIOR OF THE EVAPORATOR OF THE MICRO LOOP HEAT PIPE AND MODIFICATIONS TO THE EXISTING GLOBAL MODEL." Master's thesis, University of Cincinnati, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1152120818

    Chicago Manual of Style (17th edition)