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A pin fin apparatus is a device used to increase the heat transfer rate between two mediums, such as a surface and fluid. It is mainly used wherever it is not feasible to increase the value of surface heat transfer co efficient or the temperature difference between the surface and the fluid. This apparatus has a fin surface that extends outwards from an object, thus helping to increase the rate of heat transfer by increasing convection( heat transfer by mass motion of fluids such as air or water, happens when the heated fluid is moved away from the source of heat, thus carrying energy with it.)
The fins of this apparatus are made from highly conductive materials such as aluminum. The apparatus provides precise determination of heat distribution and is integrated with easy controls that enables simple operability. Furthermore, the apparatus is highly durable and requires minimal maintenance. The pin fin apparatus finds usage in various applications ranging from the cooling of turbine blades to helium and oxygen liquefaction plants.
Construction :
A pin fin is generally screwed to a cylindrical heating pipe, thus making the test section. This test section is kept in a rectangular duct which is open at both ends to allow natural air to flow. One acrylic sheet is also fitted to the duct to make it (the duct) and the test section visible. When the electric current input is provided to the test section, heat transfer takes place from the cylinder to pin fin. Five thermocouples are also embedded on the pin fin at fixed distances. These thermocouples measure the temperature of the pins, duct and also the surrounding temperature.
Procedure for Using a Pin Fin Apparatus
Switch on the power supply to the control panel.
Increase the power input to the heating cylinder for the requisite heat output.
Wait until steady state condition is achieved.
Take the readings of various parameters required for making calculations.
Repeat all of the above processes with various required heat inputs such as 50 w, 100 w, 200 w etc.
Advantages :
High efficiency of heat transfer, especially in gas treatment
A wider heat transfer area
High strength to weight ratio, 5 times lighter in weight compared to a shell and tube heat exchanger
Ability to withstand extreme pressure.
Also, ability to operate at lower temperature difference.
