Abstract
There are Schiller's and Boussinesq's solutions as mathematical solutions for the velocity distribution and pressure gradient in the inlet of a circular pipe for laminar flow. But they are not satisfactory solutions for over the total range of inlet length of laminar flow. We have operated, this calculation by the numerical solution which has often been used by Asawo. When this resultis compared with the Nikuradses experiment, these velocity distributions coincide over the total range except a particular part. Moreover we have got z/aK=0.24 as a inlet length of laminar flow in circular pipe, when we admit the error 1/200 as velocities and 1/100 as pressure gradients.
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