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baffles in heat exchanger
In this article I would like to discuss baffles in heat exchanger.
Many of the application of the baffle in heat exchanger some which is most important are following
- To provide strong support for the tube inside the heat Exchanger
- Increase the turbulence, increase rate of heat transfer.
Firstly i would like focus how you define it.
What is the baffle?
this are obstructer used to reduce the flow area
This are flow- directing or obstructing vane used to direct a flow of fluid. It is used in some household stoves, some industrial process tanks (vessels) such as heat exchanger (shell and tube ) chemical reactors and mixers .
It is the internal and integral part of shell and tube heat exchanger design; it gives the support of tubes which produce maximum efficiency.
types of baffles
There is different type of Baffled heat exchanger
- Longitudinal flow baffle
- Impingement baffle
- Orifice baffle
- Single segmental baffle
- Double segmental baffle
- Support baffle
- Deresonating baffle used to reduce tube vibration
Longitudinal flow baffle
As the name suggests, the baffle is installed in the longitudinal axis or parallel direction to the fluid flow . Baffle sheets within the process vessel that are parallel to the long dimensions of the vessel. .used to direct flow in the desired flow pattern.
Impingement Baffle
This type is very expensive and complicated in design . An impingement -cooled gas Turbine is also known impingement baffle during the engine operation is subject only shear forces
A baffle is provided with a pair of mounting flanges which are bonded in the forward portion of the turbine blade .
orifice baffle
In this type of. Baffle the shell side fluid follows through the clearance between the tube outside diameter and the baffle hole diameter.
single segmental baffle
In the shell and tube heat exchanger specially 1-1 shell and tube heat exchanger it gives the direction of flow in a one direction or it is used for a moderate level heat exchanging .
Types of baffles in heat exchanger
It works as the support tube and increases the strength of the tube and increases the rate of the heat transfer.
Double segmental baffle
It is used specially 2-4 heat exchanger in the and this type of baffle use widely in the chemical industries. And these baffles are eligible to give the desired rate of heat transfer .
Support baffle
A support baffle is nothing more than a circular plate with a diameter slightly less the internal diameter of a cylindrical shell. Support baffle is the main component of the shell and tube heat exchanger and gives the stability of the heat exchanger .
Deresonating baffle
The concept of the deresonating baffles in heat exchanger is to reduce the frequency of the standing area inside the heat exchanger shell in the heat transfer.
The mentioned baffle deals with concern of support and fluid direction in heat exchanger. In this way it is vital that they are spaces correctly at installation . The minimum baffle spacing is greater than 50.8. Mm or one fourth of the inner shell diameter. The maximum baffle spacing is dependent on material size and tube.
People also ask
Question: Why are baffles used in heat exchangers?
Answer: Baffles are used in heat exchangers to enhance heat transfer efficiency and improve performance. They serve several purposes, including creating turbulence, increasing surface area, preventing channeling, and controlling fluid velocity. These benefits help optimize heat transfer between the hot and cold fluids within the exchanger the baffles are used to.
Question: What is the purpose of baffles in a heat exchanger?
Answer: The primary purpose of baffles in a heat exchanger is to improve heat transfer efficiency. Baffles achieve this by creating turbulence, which enhances the contact between the fluids and promotes efficient heat transfer. Additionally, they increase the surface area available for heat exchange, prevent channeling of fluids, and control fluid velocity, all of which contribute to optimizing heat transfer within the exchanger.
Question: How do baffles work in a heat exchanger?
Answer: Baffles work by redirecting the flow of fluids within a heat exchanger. They create turbulence, disrupting laminar flow and promoting better mixing between the hot and cold fluids. This turbulence increases the heat transfer coefficient and enhances heat transfer efficiency. Baffles also divide the shell side of the exchanger into multiple passes, increasing the available surface area for heat exchange and ensuring more uniform fluid flow the baffles are used to.
Question: What is the function of baffles in reducing heat transfer inefficiency?
Answer: Baffles play a crucial role in reducing heat transfer inefficiency in a heat exchanger. They help prevent channeling, where fluids take preferential paths and bypass certain areas. By forcing the fluid to flow uniformly across the entire heat transfer surface, baffles ensure that all sections of the exchanger are utilized effectively, maximizing heat transfer efficiency. Additionally, baffles promote turbulence and increase surface area, further reducing thermal resistance and enhancing overall heat transfer.
Question: What are different types of baffles?
Answer: Baffles can come in various forms and designs, depending on the specific application and requirements. Some common types of baffles include:
- Solid Baffles: Solid baffles are flat plates or sheets that are installed within the heat exchanger to redirect the flow of fluids. They can be perforated or solid, and their positioning and arrangement determine the flow patterns and turbulence within the exchanger.
- Segmental Baffles: Segmental baffles are typically semi-circular or semi-elliptical in shape. They are placed inside the shell of a heat exchanger to divide the shell side into separate flow channels. Segmental baffles promote better fluid mixing and enhance heat transfer efficiency.
- Disc and Doughnut Baffles: These baffles have a disc or doughnut shape and are commonly used in shell-and-tube heat exchangers. They provide support to the tubes and improve fluid distribution, ensuring uniform flow across the tube bundle.
- Swivel Baffles: Swivel baffles are designed to move or rotate within the heat exchanger. They allow for adjustments in the flow distribution and can be useful in applications where fluid conditions may change.
Question: What are the different types of baffles used in heat exchangers?
Answer: The choice of baffles for heat exchangers depends on factors such as the specific heat exchanger design, fluid properties, and desired heat transfer characteristics. Some commonly used baffles in heat exchangers include solid baffles, segmental baffles, disc and doughnut baffles, and swivel baffles. These baffles serve the purpose of enhancing heat transfer efficiency, promoting turbulence, and controlling fluid flow within the exchanger.
Question: What is a baffle on a heat exchanger?
Answer: In a heat exchanger, a baffle refers to a device or structure that is placed within the exchanger to alter the flow of fluids. Baffles are typically installed on the shell side of the heat exchanger and are designed to create turbulence, increase surface area, prevent channeling, and promote efficient heat transfer between the hot and cold fluids.
Question: What are the 3 types of heat exchangers?
Answer: The three primary types of heat exchangers are:
- Shell and Tube Heat Exchangers: These heat exchangers consist of a shell (a cylindrical vessel) and a bundle of tubes within it. The hot and cold fluids flow through the shell side and tube side, respectively, allowing for heat transfer between the fluids what are baffles.
- Plate Heat Exchangers: Plate heat exchangers use a series of metal plates with corrugated surfaces to create flow channels for the hot and cold fluids. The plates are stacked together, forming alternating hot and cold fluid passages, enabling efficient heat transfer.
- Air Cooled Heat Exchangers: Air cooled heat exchangers (also known as finned-tube heat exchangers) use finned tubes to transfer heat from the fluid to the surrounding air. The fluid flows through the tubes, while ambient air passes over the fins, facilitating heat transfer.
These three types of heat exchangers each have their own advantages, disadvantages, and specific applications depending on factors such as heat load, fluid properties, space constraints, and operating conditions.
Conclusion
After reading this article I conclude that the baffles are the main component in the design of the heat exchanger . The baffle provides the support of the tube and stability of the heat exchanger. Baffle prevents the rotational flow without affecting the radial and longitudinal axis.The tank prevents swirling and vortex formation . Except in every large tank .
Baffles increase the turbulence of the fluid and enhance the Reynold number of the fluid sir to the. Due Increase the Reynolds number the velocity of the fluid particle Increase simultaneously .and the rate of the heat transfer increase due to the baffle.
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