Experimental device and method for measuring the heat transfer limit of a stepped metal heat pipe liquid-absorbing core

Abstract

The invention discloses an experimental device and method for measuring the heat transfer limit of a stepped metal heat pipe liquid-absorbing core. The device includes a pressure sensor, a protective heater, a containment shell, a thermocouple, an evaporator, a copper core mounting plate, a condenser, Liquid level controller, stainless steel pressure plate, liquid-absorbing core and polyester / cotton material, etc.; the copper core mounting plate is divided into three parts evenly along the axial direction, from left to right are the evaporation end, adiabatic end, and condensation end; the pressure sensor is connected through The components are connected to the test circuit to realize the pressure detection; the containment shell is on the periphery of the device, which can effectively prevent the leakage of working fluid; the protective heater is installed at the upper and lower ends of the containment shell, which can provide heat source; the liquid-absorbing core is clamped by stainless steel pressure plate Tight to ensure that the liquid suction core is fixed on the copper core mounting plate; the thermocouple is installed through the small hole on the copper core mounting plate to achieve temperature measurement; cooling is provided at the condensing end; the liquid level controller is installed on the lower side of the test circuit , can realize the filling and exporting of liquid.

Description

technical field [0001] The invention relates to the technical field of phase change heat equipment, in particular to an experimental device and method for measuring the heat transfer limit of a liquid-absorbing core of a stepped metal heat pipe. Background technique [0002] A simple heat pipe consists of a sealed enclosure lined with annular porous wick material. The wick is filled with working liquid in liquid state. The heat load is in contact with the casing at the evaporator end. Heat is transferred radially through the shell into the wick. This causes the liquid to evaporate, transferring mass from the wick into the shell. The added mass in the tube shell increases the pressure of the steam at the evaporating end of the tube, creating a pressure differential that drives the steam to the condensing end of the heat pipe. Heat is removed by a radiator connected at the condensation end. This causes the vapor to condense, displacing the liquid mass that had previously ...

AI Technical Summary

Problems solved by technology

When the heat transfer limit occurs, the evaporation rate of the liquid at the evaporating end is much faster than the condensation rate of the steam at the condensing end, resulting in the inability of the liquid to return and deteriorating the heat transfer performance of the heat pipe.

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