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EXPERIMENTAL INVESTIGATION OF A LOOP HEAT PIPE WITH A FLAT EVAPORATOR

DOI: 10.1615/IHTC13.p22.180
12 pages

NIMA Atabaki
Department of Mechanical Engineering, McGill University, Montreal, Canada

Bantwal Rabi Baliga
Heat Transfer Laboratory, Department of Mechanical Engineering, McGill University, 817 Sherbrooke St. W., Montreal, QC H3A 2K6, Canada

Аннотация

An experimental investigation of the steady-state operation of a loop heat pipe (LHP) with a flat (plate-type) evaporator is presented. The evaporator, the vapor-transport line, the condenser pipe, and the liquid-transport line of this LHP are all made of stainless steel. A sintered powder-metal porous plate made of stainless steel 316 is used as the wick in this LHP, and the working fluid is distilled water. The flat evaporator is not integrated with a compensation chamber. Rather, a two-phase (liquid-vapor) reservoir is attached to the loop, used during the charging procedure, and then isolated. Thus, the LHP operates with a fixed active mass of the working fluid. The vapor-transport line, the condenser pipe, and the liquid-transport line have several smooth 90° and 180° (U) bends. The vapor-transport line is well insulated, but it allows partial condensation of the vapor. These features are incorporated in the design of this LHP in order to mimic conditions encountered in practical applications. The condenser pipe is fully immersed in a constant-temperature oil bath, which serves as the heat sink. The power input to the evaporator is provided by electrical heaters. Full details of this LHP and the experimental setup and procedures are presented. The steady-state operation of this LHP was studied for three different sink temperatures and a range of power inputs. For these conditions, the saturation temperature of the vapor at the exit of the evaporator and the pressure drop across the serpentine part of the vapor-transport line are presented and discussed.

IHTC-13 Digital Library

Measurement of fluid temperature with an arrangement of three thermocouples FLOW BOILING OF A HIGHLY VISCOUS POLYMER SOLUTION