What is the purpose of baffles in heat exchanger?
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 …
What are the baffle plate and baffle seals used for?
The baffles and baffle seals help to direct air over the cylinders from the high-pressure area to the low-pressure chamber, creating an airflow that travels from top to bottom (with a few exceptions, such as the Piper Navajo and Shrike Commander, because of their airframe design)—and eventually back out of the airplane …
What is baffle cut in heat exchanger?
A segment, called the baffle cut, is cut away to permit the fluid to flow parallel to the tube axis as it flows from one baffle space to another. Segmental cuts with the height of the segment approximately 25 percent of the shell diameter are normally the optimum.
Where are baffles located in a heat exchanger?
Impingement baffles are placed opposite the shell-side inlet nozzle. The flow into the shell hits the impingement baffle and is dispersed around the tubes, rather than impinging directly on the top tubes.
What does a baffle do?
Baffles are flow-directing or obstructing vanes or panels used to direct a flow of liquid or gas. It is used in some household stoves and in some industrial process vessels (tanks), such as shell and tube heat exchangers, chemical reactors, and static mixers.
How does a baffle 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.
What is baffle seal?
The baffle seal plays an important role in effectively sealing the gap between the longitudinal baffle and the heat exchanger shell in high-performance heat exchangers. In particular, when there are small differences in temperature, even low, short-circuit currents cause a significant power loss.
How does baffle work?
Where can I find baffle cuts?
Baffle Cut and Spacing, Jc l c = baffle cut = distance from the baffle to the inside of the shell, mm or in.
What are baffle cuts?
The baffle cut is the ratio of the baffle window height to the shell diameter. Typically, baffle cut is about 20 percent. It effects both heat transfer and pressure drop. Designers also need to specify the baffle spacing; maximum spacing depends on how much support the tubes need.
What’s the purpose of baffles?
How many types of baffles are there?
There are two main types of baffle which give longitudinal flow: Orifice Baffle, Rod Baffle.