01 honeycomb jacket heat transfer characteristics Honeycomb jackets are generally stamped into square shapes by 2mm, 3mm steel plates. The cavity height is usually 6.4mm, 8mm, and the honeycomb spacing is usually 50mm, 60mm. Therefore, the gap of the honeycomb jacket is smaller than that of the ordinary jacket, the flow area is small, the flow rate of the fluid in the cavity is significantly increased (3-10 times higher than the overall jacket), and the cellular point collides multiple times to form a local small Eddy current, a large number of honeycombs act as interfering fluids in the jacket. When the fluid flows through the honeycomb, it will disturb the flow. The fluid constantly changes the flow direction and flow velocity, forming turbulence, destroying or thinning the original laminar layer. The heat (cold) exchange is accelerated, which greatly enhances the heat transfer effect. However, because the flow rate of the fluid in the jacket is not uniform, the flow velocity of the fluid in the jacket is not overcome, and the flow velocity at the corner position is small, there is a flow dead angle, and there is a dead zone of heat transfer, and the equipment is more Large, this heat transfer dead angle is more serious. 02 honeycomb jacket to prevent short circuit structure design essentials 1. It is necessary to clarify the honeycomb jacket process, media characteristics, and working conditions. If the viscosity of the medium is large, or there is a temperature difference and the pressure difference changes frequently (the equipment has fatigue tendency), the structure of the honeycomb jacket may not be used. Form, but with a full jacket or half pipe jacket. 2. Try to stagger the inlet and outlet of the honeycomb jacket. The farther the distance, the better. If the inlet and outlet ports are close, a partition plate is arranged. 3. In order to prevent the medium in the honeycomb jacket from being short-circuited and make it fully heat-transfer, a diffusion structure should be added at the entrance of the jacket medium. For example, a half-tube structure or a square tube structure is used, which is simple and convenient to manufacture. Options. 4. In order to eliminate the heat transfer dead angle, it is conceivable to add a baffle inside the jacket, which can be designed as a horizontal bar or a vertical bar, but the repeated baffling will increase the resistance, increase the pressure drop of the fluid, and reduce the flow rate. The designer has comprehensive consideration. 5. When the fluid is from top to bottom, a spiral-conducting round steel bar can be arranged in the honeycomb jacket to force the fluid to spirally flow in the jacket, which can eliminate the flow dead angle, improve the fluid flow speed, and enhance heat transfer. However, the processing is difficult, and the designer carefully chooses. Although the guide strip and the jacket and the cylinder cannot be completely sealed, the short-circuit flow is limited and there is no serious problem.
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Skateboard Anti Slip Tape
