An integral profile procedure is used to predict the effects of viscous heating and viscosity reduction on laminar flow development in a uniform pipe of circular cross-section under adiabatic conditions. The effects on fluid and pipe wall temperature, though small in the entrance region for conditions likely to be encountered in practice, become significant for viscous fluids in well-developed flow; the reduced pressure drops predicted relative to isothermal flow compare favourably with available measurements when allowance is made for the possibility of axial conduction therein.
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