Transient lumped heat pipe analyses

Abstract A transient lumped heat pipe formulation for conventional heat pipes is presented and the lumped analytical solutions for different boundary conditions at the evaporator and condenser are given. For high temperature heat pipes with a radiative boundary condition at the condenser, a nonlinear ordinary differential equation is solved. In an attempt to reduce computer demands, a transient lumped conductive model has been developed for noncondensible gas-loaded heat pipes. The lumped flat-front transient model was extended by accounting for axial heat conduction across the sharp vapor-gas interface. The analytical solutions for conventional and gas-loaded heat pipes were compared with the corresponding numerical results of the full two-dimensional conservation equations and experimental data, with good agreement.

[1]  K. N. Shukla.  Transient Response of a Gas-Controlled Heat Pipe , 1981 .

[2]  B. D. Marcus,et al.  Heat and mass transfer in the vicinity of the vapor-gas front in a gas loaded heat pipe , 1972 .

[3]  C. L. Tien,et al.  Steady Two-Dimensional Heat and Mass Transfer in the Vapor-Gas Region of a Gas-Loaded Heat Pipe , 1973 .

[4]  Amir Faghri,et al.  Transient Two-Dimensional Gas-Loaded Heat Pipe Analysis , 1994 .

[5]  R. Ponnappan.  Studies on the Startup Transients and Performance of a Gas Loaded Sodium Heat Pipe , 1989 .

[6]  S. W. Chi,et al.  Heat pipe theory and practice : a sourcebook , 1976 .

[7]  A. Faghri,et al.  Transient Multidimensional Analysis of Nonconventional Heat Pipes With Uniform and Nonuniform Heat Distributions , 1991 .

[8]  G. L. Fleischman,et al.  Steady state and transient performance of hot reservoir gas controlled heat pipes , 1970 .

[9]  T. P. Cotter,et al.  Theory of Heat Pipes , 1965 .

[10]  J. Beam.  Transient heat pipe analysis , 1985 .

[11]  Yiding Cao,et al.  TRANSIENT TWO-DIMENSIONAL COMPRESSIBLE ANALYSIS FOR HIGH-TEMPERATURE HEAT PIPES WITH PULSED HEAT INPUT , 1991 .

[12]  Amir Faghri,et al.  An analysis of the vapor flow and the heat conduction through the liquid-wick and pipe wall in a heat pipe with single or multiple heat sources , 1990 .

[13]  A. Faghri,et al.  Closed-Form Analytical Solutions of High-Temperature Heat Pipe Startup and Frozen Startup Limitation , 1992 .

[14]  Won Soon Chang,et al.  Mathematical modeling and analysis of heat pipe start-up from the frozen state , 1990 .