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    Home > Active Ingredient News > Drugs Articles > How to improve the heat transfer efficiency of pharmaceutical container jacket? (2)

    How to improve the heat transfer efficiency of pharmaceutical container jacket? (2)

    • Last Update: 2019-03-11
    • Source: Internet
    • Author: User
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    01 heat transfer characteristics of honeycomb jacket the honeycomb jacket is usually made of 2mm and 3mm steel plates, which are pressed into a square shape with a die Its cavity height is usually 6.4mm and 8mm, and the honeycomb spacing is usually 50mm and 60mm Therefore, the gap of honeycomb jacket is smaller than that of ordinary jacket, the flow area is smaller, the flow velocity of fluid in the cavity increases significantly (3-10 times higher than that of the overall jacket), and it collides with the honeycomb point for many times to form local small eddy current A large number of honeycomb in the jacket plays the role of interfering with the fluid, and the fluid will disturb the flow when flowing through the honeycomb, and the fluid constantly changes the flow direction and flow speed The turbulent flow destroys or thins the original laminar flow, accelerates the heat (cold) exchange, and greatly enhances the heat transfer effect However, due to the uneven flow velocity of fluid in the jacket, it fails to overcome the disadvantages of large flow velocity in the middle of the jacket, and small flow velocity in the corner position There is a dead angle of flow and a dead angle area of heat transfer, and the larger the equipment is, the more serious the situation of such dead angle of heat transfer is 02 structural design essentials of honeycomb jacket to prevent short circuit 1 The technological process, medium characteristics and working condition requirements of honeycomb jacket must be clearly defined If the medium viscosity is large, or there is frequent change of temperature difference and pressure difference (the equipment tends to be fatigue), the structure of honeycomb jacket may not be used, but the overall jacket or half pipe jacket, etc 2 Try to stagger the inlet and outlet nozzles of the honeycomb jacket as far as possible If the inlet and outlet nozzles are close, the separation plate shall be arranged 3 In order to prevent the short circuit of medium in the honeycomb jacket and make it fully heat-transfer, the diffusion structure should be added at the inlet of the jacket medium, such as one and a half pipe structure or square pipe structure, which is simple and convenient to make, and the designer has the priority to choose the scheme 4 In order to eliminate the dead angle of heat transfer, it can be assumed to add a guide bar in the jacket, which can be designed as a horizontal bar or a vertical bar However, due to the repeated baffling, the resistance will be increased, the pressure drop of the fluid will be increased, and the flow rate will be reduced, which needs comprehensive consideration by the designer 5 When the fluid is from top to bottom, a spiral guide round steel bar can be set in the honeycomb jacket to force the fluid to flow spirally in the jacket, which can eliminate the flow dead angle, improve the flow speed of the fluid and strengthen the heat transfer However, it is difficult to process and make, so designers carefully choose Although the guide bar, jacket and cylinder cannot be completely sealed, the short-circuit flow is very limited, and there is no big obstacle.
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