Abstract
On the problem of the heat transfer to a fluid flowing with the laminar velocity distribution through a circular pipe, at a section of which the surface temperature changes discontinuously from T0 to T1, the effects of the variation of the viscosity due to the temperature t are treated. It is assumed approximately μ=1/(A+Bt), and the temperature distribution on which the viscosity of the fluid depends is taken the average in an direction of the axis, and put approximately. t=T0+(T1-T0) r2/a2 The dissipation terms are neglected and the thermal constants except the viscosity are assumed to be independent of the temperature. Under these assumptions the equation for the temperature is solved. sa a supplemet it is shown that the effect of the natural convection to the heat transfer in the vertical pipe is calculated in the same manner.
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