A visual experimental device for supercritical pressure fluid flow and heat transfer under the condition of equal heat flow heating

Abstract

The invention provides a supercritical pressure fluid flow and heat transfer visualized experimental device under a constant heat flux heating condition, which belongs to the field of supercritical pressure fluid flow and heat transfer. The characteristics of convective heat transfer, pulsating flow and the like of the supercritical pressure fluid in a rectangular channel under effects of couplingof multi-boundary conditions and flow pattern characteristics can be investigated, and an experimental data support is provided for clarifying a physical mechanism and triggering conditions for abnormal supercritical pressure fluid heat transfer and pulsating flow phenomena.

Description

technical field [0001] The invention belongs to the field of flow and heat transfer of supercritical pressure fluid, and in particular relates to an experimental device for studying the convective heat transfer and pulsating flow characteristics of supercritical pressure fluid in a rectangular channel under the coupling effect of multiple boundary conditions, as well as the characteristics of flow form, especially relates to an experimental device. The utility model relates to a visual experimental device for supercritical pressure fluid flow and heat transfer under the condition of equal heat flow heating. Background technique [0002] Supercritical pressure fluids have been applied in many industrial fields, including supercritical steam power plants, nuclear reactor cooling water systems, supercritical water oxidation, aircraft engine thermal protection, supercritical carbon dioxide cycle, supercritical organic Rankine cycle, etc. For the heat transfer process, since the ...

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Problems solved by technology

Although the academic circles have been studying the flow and heat transfer of supercritical pressure fluids for many years, because the process is affected by multiple coupling factors (experimental objects and boundary conditions such as structure, flow, and heat transfer), the specific influence mechanism of each factor is still unclear. , simultaneous heat transfer characteristic experiment and flow visualization measurement is undoubtedly an important research approach to explore its flow heat transfer mechanism

[0003] At present, the heat transfer visualization research of supercritical pressure fluid is mostly realized through the circular pipeline window with good pressure bearing, which has the advantages of simple structure, convenient connection and high pressure resistance. After the pipeline, the visual measurement of the flow of the medium under heating conditions cannot be realized, and the key information of the abnormal heat transfer of the supercritical pressure fluid and the flow pulsation cannot be accurately obtained from the flow morphology

In addition, some studies have also realized the visual measurement of the flowing medium in the rectangular cross-section channel under the condition of heating, but due to the limited pressure bearing capacity of the rectangular channel, most of the relevant research is oriented to low pressure conditions, and its application range is limited

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