Universal high-pressure pool boiling experimental device for observing near-wall bubble behavior in all directions

Abstract

The invention discloses a general high-pressure pool boiling experimental device for observing near-wall bubble behaviors in all directions. The general high-pressure pool boiling experimental device comprises a boiling pool main body, an ITO conductive glass heating system, a constant-temperature and constant-pressure control system and the like, the pool boiling main body comprises a stainless steel boiling pool and a plurality of visual windows formed in the side wall of the stainless steel boiling pool; the ITO conductive glass heating system is arranged at the central position of the stainless steel boiling pool and is used for generating boiling bubbles for observation; the high-speed camera shooting system and the optical fiber probe system are used for observing steam bubble parameters of a heating wall surface by taking a laser source and reflecting glass as different measurement mode combinations; the temperature acquisition system is used for measuring fluid temperature and conductive glass wall surface temperature; and the constant-temperature and constant-pressure control system is used for keeping a constant-temperature and constant-pressure state in the stainless steel boiling pool. According to the invention, a variety of working media can be commonly used, near-wall bubbles are observed at the same time by combining a multi-azimuth visualization technology and a variety of measurement technologies under a high-pressure condition, and near-wall bubble behaviors and parameters can be accurately obtained.

Description

technical field [0001] The invention belongs to the experimental research field of vapor-liquid two-phase flow and heat transfer, and in particular relates to a general experimental device for high-pressure pool boiling for all-round observation of bubble behavior near a wall surface. Background technique [0002] In many industrial equipment such as boilers, steam generators, nuclear reactor cores, etc., the phenomenon of boiling is often accompanied. In these devices, due to the high heat flux density, subcooled boiling criticality is prone to occur in some cases. The behavior of the bubble near the heated wall is a key factor in studying the criticality of subcooled boiling, but it is very difficult to directly measure the bubble growth process on the heated surface in these devices, the bubble escape diameter, and the interaction between the bubble and the wall. [0003] The behavior and parameters of these near-wall bubbles are difficult to obtain through theoretical c...

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Problems solved by technology

[0004] However, in the past, these measurement methods were usually carried out separately, and it was impossible to accurately measure the characteristic parameters of the bubbles on the heating surface during boiling. In addition, the experiments to measure the characteristics of bubbles in the past were mostly based on air-water under normal pressure and low pressure conditions, and it was impossible to accurately obtain the characteristics of the bubbles under high pressure. The characteristics of the growth and evolution of boiling bubbles

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