RT Journal Article ID 1dfd28062762d2df A1 Nield, D. A. A1 Kuznetsov, Andrey V. T1 Investigation of Forsed Convection in an Almost Circular Microtube with Rough Walls JF International Journal of Fluid Mechanics Research JO FMR YR 2003 FD 2003-02-01 VO 30 IS 1 OP 10 AB Steady laminar flow of an incompressible fluid through a tube of almost circular cross-section is examined analytically, first for the case of a tube whose wall is wavy in the azimuthal direction, and then for one wavy in the axial direction. For the first case, a complete solution of the flow and forced convection heat transfer (for constant flux at the boundary) is possible for a wall of arbitrary cross-section. It is shown that, for a fixed axial pressure gradient, any departure from circularity leads to a reduction in volume flux and a reduction in heat transfer. For the second case no simple analytic solution is possible, but estimates of the increase in resistance due to a departure from circularity have been made. PB Begell House LK https://www.dl.begellhouse.com/journals/71cb29ca5b40f8f8,6e18a7c465b357b2,1dfd28062762d2df.html