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For the open type food refrigerated display cabinet, the air curtain is mainly to separate the air inside and outside the cabinet, which plays an important role in isolating the penetration of external heat. At the same time, the performance of the air curtain also has a great impact on the temperature and speed distribution inside the cabinet. The researchers mainly focus on the flow and heat transfer mechanism of the wind curtain and the optimization of the wind curtain.

Flow and heat transfer mechanism of wind curtain
The flow and heat transfer mechanism of the air curtain is not only related to the outlet velocity, temperature and initial turbulence intensity of the air curtain, but also affected by the spatial turbulence buoyancy and the external environment factors of the cabinet. After the air curtain flows out from the nozzle, it is divided into two parts: the initial part and the main part. The velocity of the former central flow is constant, while that of the latter is weakening. Because the length and viscosity of the two regions are closely related to the initial turbulence intensity, the two different regions need to be considered in the solution of the vertical jet. In addition, researchers divide the air curtain flow into three different areas: the exit area, the development area and the return area. Their closure capacity decreases in turn. The first two areas are mainly affected by the air curtain outlet speed, while the third area is mainly affected by the air curtain return structure. The flow velocity and direction of the air curtain in the exit area are high, and the flow starting point and development direction of the development area are mainly affected by the exit area, while the flow direction of the return air area will be distorted under the influence of the suction of the return air. Computational fluid dynamics (CFD) is an effective technology to improve the structure of refrigeration equipment and optimize the internal flow field. It can simulate the fine temperature field and flow field in the flow area. Some scholars use CFD technology to simulate the distribution of air distribution velocity and temperature in the cold storage, which provides a theoretical reference for optimizing the arrangement of fans and goods in the cold storage. Zhao Xinxin et al. Studied the influence of the guide rail of the refrigerated car body on the temperature distribution in the car through numerical simulation, which provided theoretical guidance for the performance optimization of the refrigerated car with single evaporator and multi temperature zone.China Super Freezer manufacturers
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