Use of segmental baffle in shell and tube heat exchanger for nano emulsions

Abstract

Among the heat exchangers (HE), the shell and tube type is being widely used in different applications like oil, chemical, and power plant Industries. The incorporation of segmental baffles (SB) improves the HE capacity from higher temperature fluid to lower temperature fluid. Nanofluids can be effectively used to enhance the heat transfer rate. In this study, numerical simulations have been carried out in a shell and tube heat exchanger (STHX). Among HE design methods, Tubular Exchanger Manufacturers Association (TEMA) standard is being used for better design by many researchers. In this paper, the computational fluid dynamics analysis was carried out with Al2O3, CuO, and SiO2 nanofluids amid 1, 3, and 5 vol. % with water emulsion to enhance the heat transfer coefficient of STHX. The nanofluid has been used in the cold fluid of the HE and on the other side hot water is used. From the results, it is noticed that with the increase of Nanofluids, the value of heat transfer coefficients is found to be increasing. The overall heat transfer coefficient has been enhanced for Al2O3, CuO, and SiO2 about 10.41%, 12.27%, and 9.56%, respectively, at 0.22 kg/s for the 5 vol. % addition. It is also depicted that the pressure drop is increasing with the incorporation of nanofluids.

Theoretical and numerical study of a shell and tube heat exchanger using 22% cut segmental baffle

“…Due to the high expense of experimental setup, the numerical and theoretical works are considered to predict the results in industries at a laboratory scale. Geometrical parameters are taken from previous studies by Gugulothu et al 9,14 The adiabatic boundary condition is considered for shell wall, the mass flow rate is given as inlet from the ranging 0.23 to 0.43 kg/s at 343.15 K in shell side and 301.15 K as temperature, and 0.22 kg/s mass flow rate of tube side is given as boundary conditions at atmospheric pressure as outlet pressure on both shell and tube side. Figures 2 and 3 give some dimensions, those dimensions are given as 31.75 mm is Mustapha Mellal et al 4 Segmental baffle 09 0.640 Wilfried et al 6 Segmental baffle 92 1.650 Roetzel and Lee 7 Ahmed et al 11 Segmental baffle 37 0.500…”

“…As many literature papers suggested that this method is giving accurate results. The governing equations are given in Equations ( 5)- (9).…”

Effect of helical baffles and water‐based Al2O3, CuO, and SiO2 nanoparticles in the enhancement of thermal performance for shell and tube heat exchanger

“…The specific heat of nanofluids can be calculated by Xuan and Roetzel 23,24,26,30,31 $$${(\rho {C}_{p})}_{{\rm{n}}{\rm{f}}}=(\rho {C}_{p})-\varphi {(\rho {C}_{p})}_{w}+\varphi {(\rho {C}_{p})}_{p}.$$$…”

“…Maxwell developed a model which is statistically applicable to homogeneous, low volume concentration single‐phase nanofluids which are uniformly sized for solid‐liquid suspensions of spherical particles. The thermal conductivity 24,30 is calculated by using an Equation (3) 31 $$${k}_{\mathrm{nf}}=\frac{{k}_{\mathrm{np}}+m{k}_{f}-{k}_{f}-(m\varphi -\varphi )({k}_{f}-{k}_{\mathrm{np}})}{{k}_{\mathrm{np}}+m{k}_{f}-{k}_{f}+\varphi {k}_{f}-\varphi {k}_{\mathrm{np}}},$$$where k f = 3.…”

“…Viscosity of nanofluids is calculated by using the Einstein equation 24,30,31 $$${\mu }_{\mathrm{nf}}=\frac{{\mu }_{f}}{{(1-\varphi )}^{\frac{1}{4}}}.$$$…”