Experimental system for measuring convective mass transfer coefficient and measuring method

Abstract

The invention belongs to the technical field of heat and mass transfer instruments, and discloses an experimental system for measuring a convective mass transfer coefficient and a measuring method. The method comprises the steps of heating the water in two water tanks to a same temperature through an electric heater; testing the electric heating power consumption difference of the two water tankswithin the same time, and calculating the convective mass of an open water tank; finding the moisture content of the inlet air of the open water tank by utilizing an enthalpy-humidity diagram; measuring the water temperature of the open water tank, finding out the saturated steam pressure at the water temperature, and calculating to obtain the moisture content of the saturated air on the water surface of the open water tank; calculating the surface mass transfer concentration difference of the open water tank; and carrying out inverse computing on the convective mass transfer coefficient of the surface of the open water tank by utilizing the convection mass and the mass transfer concentration difference. According to the invention, the accurate convective mass transfer coefficient can be obtained, and the device has great energy-saving potential in life and can also save water; at the aspect of profession, professionals can understand the mass transfer theoretical knowledge more deeply, the mass transfer calculation is more convenient, and the reference significance is achieved.

Description

technical field [0001] The invention belongs to the technical field of heat and mass exchange equipment, and in particular relates to an experimental system and a measuring method for measuring convective mass transfer coefficient. Background technique [0002] At present, there are convective mass transfer phenomena in all aspects of life, and the convective mass transfer phenomenon of air flowing along the water surface is well known. The water loss rate caused by mass transfer on the surface of the water body cannot be ignored, and the energy consumed by water evaporation , is also an important source of energy consumption. However, in order to calculate the mass transfer and heat transfer caused by evaporation on the water body surface, the convective mass transfer coefficient must be measured in advance. [0003] There is no good measurement method for the convective mass transfer coefficient on the surface of a water body. Most of them are calculated through theoretic...

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Problems solved by technology

[0004] To sum up, the problems existing in the existing technology are: the measurement process is complicated, and the accurate convective mass transfer coefficient cannot be measured; at the same time, the convective mass transfer coefficient is not accurate, and it is difficult to accurately calculate the water evaporation loss and heat dissipation loss, which increases the energy consumption. waste

[0005] Difficulties in solving the above technical problems: First, it is necessary to accurately simulate on-site environmental parameters, including temperature, wind speed, pressure and other parameters

Second, it is necessary to accurately measure the mass transfer flux, which is difficult to measure directly, and the mass transfer flux can only be deduced by other means

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