内側円筒の回転する同心二重円管の熱伝達

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  • Heat Transfer in an Annulus with an Inner Rotating Cylinder
  • ウチガワ エントウ ノ カイテン スル ドウシン ニジュウエンカン ノ ネツ デンタツ

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The heat transfer by the convection in the annular gap between the rotating inner cylinder and the stationary outer cylinder was measured in the air, spindle oil and mobil oil at varying rotational speeds, cylinder diameters and widths of gap. The results show that characteristics of the flow and heat transfer have two modes. If the rotational speed is low and the width of gap is narrow, namely (vδ/ν)(δ/r)1/2<41, the flow is laminar and the heat is transfered by conduction and radiation. But if (vδ/ν)(δ/r)1/2>41, the rate of heat transfer increases with rotational speeds under the influence of secondory vortexes by the centrifugal force, which may be given by [numerical formula]Where U denates the overall coefficient of heat transfer through the gap, δ the width of the gap, λ the thermal conductivity, ν the kinematic viscosity and Pr the Prandtl Number, r and v are the radius and the peripheral velocity of the rotating cylinder respectively.

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