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Convective transport around two rotating tandem circular cylinders at low Reynolds numbers

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Abstract

The convective transport around two rotating circular cylinders kept in a tandem configuration to an unconfined flow of an incompressible fluid (Prandtl number, Pr = 0.717) is investigated through two-dimensional numerical simulation. The flow Reynolds number is considered constant at Re = 100. Four different gap spacings between the tandem cylinders such as 0.2, 0.7, 1.5 and 3.0 are chosen for simulation. The cylinders are rotating about their centroidal axes for a range of dimensionless speed \( \left( {0 \le \Omega \le 2.75} \right) \). The rotation to the objects causes the unsteady periodic flow around them to become stabilized and at some critical rotational speed, the vortex shedding stops completely resulting in a steady flow pattern. The critical speed of rotation at which the vortex shedding completely stops is a function of the cylinder spacing. Overall, it is observed that increasing the gap increases the critical rotation rate. The thermal fields are also strongly stabilized as a result of the cylinder rotation. The rotating cylinders actually create a zone in their proximity which acts like a buffer to the convective transport. The conduction mode of heat transfer predominates in these regions causing the heat transfer rate to assume a decaying pattern with increasing the rotational speed at all cylinder spacings.

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Abbreviations

C L :

Lift coefficient

C p :

Pressure coefficient

d :

Cylinder diameter (m)

f :

Vortex shedding frequency (Hz)

g :

Cylinder spacing (m)

g* :

Normalized gap spacing

N:

Normal direction

Nu:

Nusselt number

p :

Dimensionless Pressure

Pr :

Prandtl number

Re :

Reynolds number

St :

Strouhal number

t :

Time (s)

T :

Temperature (K)

\( T_{\infty } \) :

Free stream temperature (K)

\( U_{\infty } \) :

Free stream velocity (m/s)

T w :

Cylinder wall temperature (K)

x, y :

Coordinates (m)

\( \alpha \) :

Thermal diffusivity (m2/s)

\( \nu \) :

Kinematic viscosity of fluid (m2/s)

\( \theta \) :

Polar angle (rad)

\( \Theta \) :

Dimensionless temperature

\( \rho \) :

Density of fluid (kg/m3)

\( \omega \) :

Rotational speed (rad/s)

\( \Omega \) :

Dimensionless rotational speed

av :

Average

cr :

Critical

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Authors and Affiliations

  1. Advanced Design and Analysis Group, CSIR-Central Mechanical Engineering Research Institute, Durgapur, 713209, India

    Dipankar Chatterjee

  2. Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India

    Dipankar Chatterjee & N V V Krishna Chaitanya

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  1. Dipankar Chatterjee
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  2. N V V Krishna Chaitanya
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Correspondence to Dipankar Chatterjee.

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Chatterjee, D., Chaitanya, N.V.V.K. Convective transport around two rotating tandem circular cylinders at low Reynolds numbers. Sādhanā 45, 107 (2020). https://doi.org/10.1007/s12046-020-01358-6

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