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 is the purpose of a baffle?
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.
Why baffles are used in reactor?
A baffle is an integral part of the vessel’s mixing system that promotes better flow of fluids for maximum efficiency . ... Its primary function is to prevent the swirling in agitation by converting the swirling into a desired flow pattern.
What is the purpose of using baffles during mixing?
Baffles establish an axial flow pattern, minimizing the tangential or swirl component imparted by the rotation of mixing impellers . The baffled flow pattern facilitates top-to-bottom bulk motion, increasing the velocity across heat transfer surfaces and facilitating blending and solid suspension.
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.
Do baffles affect performance?
The most obvious disadvantage associated with exhaust baffles is the increased back pressure they cause . ... This process leads to the formation of additional pressure (back pressure) on the vehicle engine, leading to a reduction in engine horsepower output and torque and increasing strain on the engine.
What is baffle cut?
In case of cut-segmental baffle, a segment (called baffle cut) is removed to form the baffle expressed as a percentage of the baffle diameter. Baffle cuts from 15 to 45% are normally used. ... The % cut for segmental baffle refers to the cut away height from its diameter . Figure 1.6 also shows two other types of baffles.
Which is not the use of baffles?
11. Which of the following is not the use of baffles? Explanation: The Baffles are metal strips about one-tenth of vessel diameter attached to the wall. They prevent vortex and improve aeration efficiency.
What is the function of baffles in hydraulic system?
Baffles work to efficiently separate the return flow from the inlet flow . Additionally, baffles help the reservoir fluid circulate which promotes heat dissipation from the fluid.
Why do the heads of multi pass heat exchangers have baffles?
A series of baffles directs the flow of cooling fluid back and forth across the tube bundle . ... The fluid at the higher pressure should pass through the tubes (tube-side). This saves the expense of a high pressure shell. The fluid most likely to cause fouling within the exchanger should be tube-side.
How do baffles prevent vortex?
In the baffled STR, a baffle on the inner wall of the tank prevents vortex formation but it increases turbulence in the fluid and so increases aeration (Fig. 5). Baffles can also be used in conical flasks for small-scale cultures.
Is it bad to run a motorcycle without baffles?
Running a motorcycle without its baffles is not bad for the engine. It will not cause any engine damage . ... To get the most out of baffles removal, make sure to rejet or tune your motorcycle afterwards. This ensures you still have the right air / fuel ratio – allowing you to even gain some performance in the end.
Is removing baffles bad?
Removing baffles on your motorcycle will not directly harm or damage the engine . However, it may result in the engine running leaner, causing a problem with its performance and complications to the emissions. Removing the baffle does not add any performance benefit or enhancements to the engine.
What is a baffle silencer?
Baffle silencers, housed in rectangular or cylindrical enclosures, include one or more acoustic absorbent baffles. Constructed as a cassette, each baffle contains the absorbent material that converts noise energy into friction heat .
Is it OK to take the baffles out of a Harley?
Harley’s exhaust system has gotten quieter throughout its evolution. If you are looking for a way to add more sound, an easy way to do it is to remove the baffles. The baffles are located in the pipes of the exhaust system of your Harley and can be removed without damaging the bike.
How are baffle cuts calculated?
l c = baffle cut = distance from the baffle to the inside of the shell , mm or in.
