What is the optimum baffle spacing?
What is the optimum baffle spacing?
So optimum baffle spacing is suggested between 8 to 12 inches (43 to 63 percent of inside shell diameter) for a sufficient heat duty, low cost and low pressure drop.
Where are baffles located in a heat exchanger?
Baffles are placed in shell and tube heat exchanger such that they can give direction to the fluid flow. Baffle design and tolerances for heat exchangers are discussed in the standards of the Tubular Exchanger Manufacturers Association (TEMA).
How are baffle cuts calculated?
Baffle Cut and Spacing, Jc l c = baffle cut = distance from the baffle to the inside of the shell, mm or in.
What is the purpose of using baffles in a heat exchanger?
The main roles of a baffle in a shell and tube heat exchanger are to: Hold tubes in position (preventing sagging), both in production and operation. Prevent the effects of steam starvation, which is increased with both fluid velocity and the length of the exchanger. Direct shell-side fluid flow along tube field.
How does the presence of baffles affect the heat transfer and the pumping power requirements explain?
Baffles increase heat transfer in two ways. Firstly, they force flow to cross the tube bundle instead and in this way prevent stagnant sections. Secondly, they increase the shell-side velocity, which corresponds to more turbulence and increased heat transfer.
What will a larger baffle pitch contribute?
Increasing the tube pitch also increases the flow area through the tube bundle and thereby lowers the pressure drop. Increasing the baffle cut reduces the length of the cross-flow path through the bundle, which reduces the pressure drop.
What is the role of baffles in fermenter?
Baffles are obstructing vertical arranged vanes or elongated plates inside the vessel needed to stop the radial swirl inside the fermenter and convert the rotational flow to axial mixing.
How do you calculate baffle thickness?
How do I calculate the required thickness and supports for anti-swirl tank baffles? The maximum hydraulic force, in pounds, acting on each baffle can be calculated from the transmitted torque, divided by one half the distance between the baffles edges and by the number of baffles.
How do you know how many passes in heat exchanger?
The number of passes in a heat exchanger is generally determined by the total flow of tube side fluid, the exchanger area requirement, allowable pressure drop and any limitations in tube length (location, access, bundle pulling requirements, etc).
Do baffles increase velocity?
Baffles serve two functions: Most importantly, they support the tubes in the proper position during assembly and operation and prevent vibration of the tubes caused by flow-induced eddies, and secondly, they guide the shell-side flow back and forth across the tube field, increasing the velocity and the heat transfer …
How do baffles work?
3 days ago
How do Baffles Work? Baffles work by disrupting the flow pattern and providing top to bottom flow. By ensuring that top to bottom flow is achieved in addition to swirling flow, baffles are able to prevent this from happening.
