Numerical simulations of Newtonian fluid flow through a suddenly contracted rectangular channel with two different types
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Numerical simulations of Newtonian fluid flow through a suddenly contracted rectangular channel with two different types of baffle plates Sandip Saha1
· Pankaj Biswas1 · Sujit Nath2 · Lokendra Singh1
© Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Numerical analysis of turbulent air flow structure through a rectangular channel along with multiple and different types of baffle plates has been performed, which is an important issue for heat exchangers and for that the flow characteristics and pressure drop are need to be identified. Finite Volume Method are employed to solve the governing equations using FLUENT with the Standard k − turbulence model. The present study has been validated at Re = 87,300 with the studies of Dermitini et al. The aim of this study is to investigate the dynamic behavior of turbulent air flow, baffle height, baffle thickness and arrangement of baffle in different locations for high values of Re = 88,000. Moreover, flow structure and pressure drop characteristics are discussed in the presence of trapezoidal and plane shape baffles. Normalized velocity profiles and skin friction coefficients have been studied at different locations for trapezoidal and plane baffle plates. Finally, it has been concluded that pressure drop attains its maximum value at the upstream of the channel and minimum value at the downstream of the channel for both the plane and trapezoidal shape baffles. It is ensured that in trapezoidal case axial velocity is higher than plane baffle when four baffles are alternately placed at lower and upper walls. Furthermore, it has also been revealed that the separation of boundary layer is influenced by baffle height (h) and baffle thickness (b). At x = 0.170 m, normalized velocity profiles (u/u 0 ) are presented for wide range of Reynolds number, Re ∈ [44,000 − 176,000] to reveal that increase of Re causes the increase in vortexes. Keywords Turbulent flow · Plane channel · Rectangular & trapezoidal baffle plate · Standard k − model
1 Introduction Turbulent flow through sudden contraction channel with baffle plates has numerous pragmatic applications in many Communicated by Kannan.
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Pankaj Biswas [email protected]; [email protected] Sandip Saha [email protected] Sujit Nath [email protected] Lokendra Singh [email protected]
1
Department of Mathematics, NIT, Silchar, Assam 788010, India
2
Department of Mechanical Engineering, NIT, Silchar, Assam 788010, India
engineering fields, such as solar collectors, chemical reactors, filtration and desalination. The baffle plates are usually applied in shell and tube heat exchangers, where fluid flows through the shell. In recent years, many research works have been conducted by several authors to improve the accuracy of heat exchanger models in the presence of baffle plates but only the relevant articles are cited here. In 1937, separation of boundary layer and flow visualization in various models of heat exchanger have been studied by Wiemer (1937). They stated that flow
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