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 twodimensional 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 (m^{2}/s)
 \( \nu \) :

Kinematic viscosity of fluid (m^{2}/s)
 \( \theta \) :

Polar angle (rad)
 \( \Theta \) :

Dimensionless temperature
 \( \rho \) :

Density of fluid (kg/m^{3})
 \( \omega \) :

Rotational speed (rad/s)
 \( \Omega \) :

Dimensionless rotational speed
 av :

Average
 cr :

Critical
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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/s12046020013586
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Keywords
 Vortex shedding suppression
 rotating circular cylinders
 heat transfer
 tandem arrangement
 simulation
 critical speed