Essay: Engineering – baffles

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  • Subject area(s): Engineering essays
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  • Published on: October 19, 2015
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  • Number of pages: 2
  • Engineering - baffles
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Many engineering applications with baffles such as thermal regenerator, Shell and tube type heat exchanger, Internal cooling system of gas turbine blades, radiators for space vehicles and automobiles, etc. are applied to enhancement the heat transfer. Baffles are applied as turbulence promoters. Baffles are one method that used to increase the thermal performance. Thermal boundary layer is breaking as fluid flowing through the baffle surfaces.
Most of the baffles found in literature are square, rectangular, triangular, helical or wedge shaped in the present work disk baffles have been studied.
Many techniques have theoretically and experimentally studied the have investigated flow and heat transfer through baffle channel numerically and experimentally. Mayank Vishwakarma et al. (2013) [1] an attempt made to decrease the pressure drop and to increase the heat transfer and the ratio of heat transfer and pressure drop in shell and tube type heat exchanger by tilting the baffle angle up to which we get the minimum pressure drop. It analyzes the conventional segmental baffle heat exchanger using the Kern’s method with fixed shell side flow rates and varied volume flow rate. The results in this method give us clear idea that the ratio of heat transfer coefficient per unit pressure drop is maximum in helical baffle heat exchanger as compared to segmental baffle heat exchanger. Sunil S. Shinde et al. (2012) [2] both hydrodynamic studies & testing of heat transfer & the pressure drop on research facilities & industrial equipment showed much better performance of helically baffled heat exchanger when compared with conventional ones. The new design reduces dead zones within the shell space. These results in relatively high (Heat transfer co-efficient/Pressure drop) & low shell side fouling. Thus, the helix changer exhibits much more effective way of converting pressure drop into a useful heat transfer than conventional heat transfer. This project is basically gives the performance of shell & tube heat exchangers with helical baffles.
Kang-Hoon Ko, N.K. Anand (2003) [3] have investigated experimentally the average heat transfer coefficient in a rectangular channel which was heated from all the four sides, porous baffles were mounted alternately on the top and bottom walls in staggered manner. Reynolds number was varied between 20,000 and 50,000. The experiment was conducted with three different pore densities (viz.: 10 PPI, 20 PPI, and 40 PPI) and two different thickness (viz.: 1and 0.25in.). Material used for baffle was aluminum foam material.
EL-SHAMY (2006) [4] determined the effect of turbulent flow and heat transfer behavior in an annulus with perforated disc-baffles aligned along the inner heated tube surface, using air as a working fluid. The effects of the baffle spacing, the baffle open area ratio, and flow Reynolds number on the thermal performance were examined.
In the present study, experimental and theoretical study the problem of laminar forced convection in a horizontal circular duct with disk baffle. The circular duct is composed of disk baffle and three heaters which all configuration peaks lie in an in-line arrangement. The flow is steady, laminar, incompressible and two dimension. The experiments were conducted to examine the effect of using baffle on heat transfer and fluid flow characteristics of air flow in a tube.

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