摘要：

A simple algebraic solution is presented for the volume rate of flow of a power-law non-Newtonian fluid through a concentric annulus in laminar flow. This expression is valid for all values of the flow behavior index n (not just reciprocal integers as in previous solutions) and all values of the annulus aspect ratio σ = R1/R. The present solution allows calculation of either volume flow or pressure loss directly using only a pocket calculator. Previous authors obtained their results in terms of a definite integral which they could not evaluate for arbitrary n values. It is shown how this integral may be evaluated analytically to obtain a simple algebraic result valid for all n, σ in the range.

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