Mixed convective transport around tandem circular cylinders in an unconfined medium

Krishna Chaitanya, N.V.V.; Khambra, Sourabh; Chatterjee, Dipankar

doi:10.1016/j.nucengdes.2024.112969

Nuclear Engineering and Design

2024

DOI: 10.1016/j.nucengdes.2024.112969

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Mixed convective transport around tandem circular cylinders in an unconfined medium

N.V.V. Krishna Chaitanya,

Sourabh Khambra,

Dipankar Chatterjee

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2024

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Cited by 2 publications

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CFD study of heat transfer in power‐law fluids over multiple corrugated circular cylinders in a heat exchanger

Rajpuriya,

Shyam

2024

Heat Trans

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The heat transfer in power‐law fluids across three corrugated circular cylinders placed in a triangular pitch arrangement is studied computationally in a confined channel. Continuity, momentum, and energy balance equations were solved using ANSYS FLUENT (Version 18.0). The flow is assumed to be steady, incompressible, two‐dimensional, and laminar. A square domain of side 300Dh is selected after a detailed domain study. An optimized grid with 98,187 cells is used in the study. The convergence criteria of 10−7 for the continuity, x‐momentum, and y‐momentum balances and 10−12 for the energy equation were used. Constant density and non‐Newtonian power‐law viscosity modules were used. The diffusive term is discretized using a central difference scheme. Convective terms are discretized using the Second‐Order Upwind scheme. Pressure–velocity coupling between continuity and momentum equations was implemented using the semi‐implicit method for pressure‐linked equation scheme. Streamlines show wake development behind the cylinders, which is very dominant at large ReN and n. Isotherm contours are cramped at higher values of ReN and PrN, implying higher heat transfer. Global parameters, like, Cd and Nu, are computed for the wide ranges of controlling dimensionless parameters, such as power‐law index (0.3 ≤ n ≤ 1.5), Reynolds (0.1 ≤ ReN ≤ 40), and Prandtl (0.72 ≤ PrN ≤ 500) numbers. The NuLocal plot attains a pitch near the corrugation of the surface due to abrupt changes in velocity and temperature gradients. Nu increases with ReN and/or PrN and decreases with n under ot herwise identical situations. Nu is correlated with pertinent parameters, namely, ReN, PrN, and n.

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CFD study of heat transfer in power‐law fluids over multiple corrugated circular cylinders in a heat exchanger

Rajpuriya,

Shyam

2024

Heat Trans

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Unsteady wake and heat transfer characteristics of three tandem circular cylinders in forced and mixed convection flows

Zhu,

Zhong,

Liu

et al. 2024

Physics of Fluids

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In natural convection (high Richardson number Ri), a high Prandtl number (Pr) leads to thinner thermal boundary layers, enlarging the thermal gradient and hence the enhancement of buoyancy effect. In forced convection (low Ri), a high Pr introduces thicker velocity boundary layers. In mixed convection scenarios, where both forced and natural convection are significant, the interaction between Pr and Ri determines the resultant flow pattern and heat transfer characteristic. Three tandem circular cylinders with an identical spacing ratio of 4.0 in both forced and mixed convection flows were numerically investigated by using finite element method. The computations were carried out in the range of Pr = 5–50 and Ri = 0–2 at a low Reynolds number of Re = 150. The results of the squared strain rate and the vorticity shed light on the enstrophy transfer process. Thermal plume structures in the far wake originate from the upper dispersed vortices due to the high superimposed buoyancy at low Pr, while they are suppressed at high Pr. The increase in Pr plays a role as the flow stabilization, while the growth of Ri plays the reverse role. The time-averaged velocity, pressure coefficient, and temperature become more asymmetrical at high Ri. The Nusselt number of the upstream cylinder is approximately equal to the empirical result without the consideration of thermal buoyancy. Due to the thermal buoyancy, the migration of shear layers along the cylinder surface leads to the frequency alteration and harmonic frequency in the drag, lift, and Nusselt coefficients.

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Mixed convective transport around tandem circular cylinders in an unconfined medium

Cited by 2 publications

References 58 publications

CFD study of heat transfer in power‐law fluids over multiple corrugated circular cylinders in a heat exchanger

CFD study of heat transfer in power‐law fluids over multiple corrugated circular cylinders in a heat exchanger

Unsteady wake and heat transfer characteristics of three tandem circular cylinders in forced and mixed convection flows

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