High-efficiency and high-precision measurement experimental device for natural convection heat transfer coefficient

Abstract

The invention provides a high-efficiency and high-precision measurement experimental device for a natural convection heat transfer coefficient. The device comprises a unit-pipe pipe wall, a primary heating rod, an auxiliary heating rod, an insulating sheet, a heat-insulation jacket, heat-isolation end covers, a film thermocouple, terminal sleeves, an A / D (Analog / Digital) converter, a computer, a control box and a bracket. The insulating sheet is inserted between the primary and auxiliary heating rods of the device to form close connection; pipe cavities at an effective experimental section and an auxiliary experimental section which are corresponding to the primary and auxiliary heating rods respectively are spaced by using the annular heat-insulation jacket; the temperatures of the adjacent terminal sleeves of the primary and auxiliary heating rods are controlled to be the same through regulating the current and the voltage of the auxiliary heating rod, so as to reduce the axial heat loss of the primary heating rod; the internal surface silvered heat-isolation end covers are sleeved at each unit-pipe port; high-temperature-resistant heat-isolation foam mats are filled in gaps among the heat-isolation end covers and unit pipes, so as to reduce the heat loss due to radiation at an auxiliary-section port; the external surfaces of the unit pipes are slivered, and the internal surfaces of the unit pipes are plated with high-radiance materials, so as to shorten an experimental time. The measurement problem of the natural convection heat transfer coefficient is solved highly efficiently and highly precisely.

Description

technical field [0001] The invention relates to the field of natural convection heat transfer coefficient measurement, in particular to an efficient and high-precision natural convection heat release coefficient measurement experimental device. Background technique [0002] The convective heat transfer coefficient is an important parameter to measure the strength of convective heat transfer, and it is also an important heat transfer parameter that must be obtained in advance when performing relevant convective heat transfer calculations. In engineering, it is generally obtained by experimental methods and calculation methods. When it is obtained by calculation methods, it is generally necessary to use experimental methods to verify its reliability. At present, the experimental device for testing the heat release coefficient of free convection horizontal tubes used in the heat transfer experiments of colleges and universities is based on the principle that the heat generated ...

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Problems solved by technology

[0003] Aiming at the problems of large error in experimental results, too long experimental time and low experimental efficiency in existing devices, the present invention aims to provide a high-efficiency and high-precision natural convection heat release coefficient measurement experimental device, which can effectively solve the problem of existing free Disadvantages of the convection horizontal tube external heat release coefficient measuring device are large measurement error, long experiment time, and low experiment efficiency.

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