How do you find the heat transfer coefficient?
The most common way of doing this is by dividing the thermal conductivity of the convection fluid by a length scale. It is also common to calculate the coefficient with the Nusselt number (one of a number of dimensionless groups used in fluid dynamics).
Why do we provide baffles choose the option that is incorrect?
Why do we provide baffles? Choose the option that is incorrect. Explanation: Baffles are specially provided to act as mechanical support to the tubes and increase the turbulence on the shell side. The consequence of this leads to an increase in the overall heat transfer coefficient.
Which fluid among a pair of fluids will be preferred to be kept on the shell side of a shell and tube heat exchanger?
When more viscous fluid is kept on the shell side, the increased turbulence will result in increased heat transfer coefficient and improved overall heat transfer. Fluid with higher flow rate is generally preferred to be kept on the shell side.
What is the purpose of using baffles in shell and tube 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.
Why do we use baffles in heat exchanger?
Baffles also serve as support s for the tubes during operation and help in preventing vibration from flow induced eddies. Although heat transfer is increased through the baffle arrangement, the pressure drop of the shell side fluid is also increased due to the decreased flow area, leakage and bypass effects.
What do baffles do in a 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 …
Is baffle the same as confused?
To baffle is to confuse. If you are completely puzzled as to what baffle means, you might say that this word baffles you. Baffle means “confuse,” but it can also mean “amaze.” A magician might baffle you with an impressive magic trick.
What is another word for Baffle?
Some common synonyms of baffle are balk, foil, frustrate, and thwart. While all these words mean “to check or defeat another’s plan or block achievement of a goal,” baffle implies frustration by confusing or puzzling.
What is a baffle in exhaust?
An exhaust baffle is an acoustically tuned metallic chamber placed inside a motor vehicle’s muffler to cancel out, or muffle, the sound from the vehicle’s exhaust outlet.
Will removing baffles damage engine?
It is possible to damage your engine by removing baffles from your exhaust. It is possible to damage your engine by removing baffles from your exhaust. Removing baffles from the exhaust provides for a freer flowing exhaust, causing your exhaust to become louder and flow more air or flow air faster.
Will removing baffles hurt my bike?
As for your bike- if you remove baffle(s) from the muffler, your bike will be louder and also slightly more powerful. There will not be any impact on engine health or longevity.
How does baffle size affect sound?
If we’re talking about straight through pipes with no mufflers/baffles then a smaller diameter pipe will give you a snappier sound (high frequency) and a larger diameter pipe will give you a deeper sound (low frequency). A baffle is a mechanical device used to disrupt sound waves.
What is baffle step correction?
The so called ‘baffle step’ is an increase in output from a loudspeaker as the size of the baffle becomes significant in terms of the wavelength of sound for a range of frequencies.
Do db killers affect performance?
A db killer on a slipon is not harmful for your engine and witha stock map may even improve your performance. However, running a complete open system that has been mapped and then adding a DB killer will influence your performance in a negative way. Live to ride!
How does Speaker shape affect sound?
The cabinet shape and volume, material, stuffing and positioning in the room all affect sound. The position of a driver on the baffle (for mid and high frequencies) will have an effect on the sound as will how its mounted (flush mounted, chamfered etc).
How can you tell good quality speakers?
The higher the sensitivity rating, the louder your speaker is. An average speaker comes with a sensitivity of around 87 dB to 88 dB. A speaker with a sensitivity rating over 90 dB is considered excellent.
Are old speakers better than new ones?
In my opinion, old speakers can be just as good as new ones. I much prefer the sound of my Klipsch Heresy HBR’s to the sound of most moderately priced speakers. Generally modern speakers have lower distortion and produce more bass in smaller enclosures.