The conduit Reynolds of smooth canal counts Re_PCompare the relation of V/Vmax with speed

The experiment makes clear, when exterior condition geometric similarity (the pipe of geometric similarity, the fluid has shed the) such as the object of geometric similarity, if their Reynolds number is equal, criterion fluid flow condition also is geometric similarity (hydrokinetics likeness) . This one similar pattern spreads the base that the quantity measures throttle unit to standardize just about. Visible, reynolds counts the character of going from place to place that reflected a fluid exactly is the parameter that discharge measures middling to use.

The discharge expression that Reynolds counts is:

M—— is measured the H of ／ of mass flow Kg of medium:

Q—— is measured the H of ／ of cubage discharge M of medium;

Mm of D—— conduit internal diameter;

Be measured below V—— job status the dynamical viscosity Pa·S of medium

Be measured below P—— job status the athletic viscosity M of medium²/ S

The constant in type is worth, the unit of each parameter in depending on type is different and different. When the unit that in using blame formula, appoints, invariable value should be made amend accordingly.

When use Reynolds is counted, should notice its finalize the design correspondingly dimension. What count Re in the Reynolds that give out commonly is right next horn are noted pile up with horn, make clear correspondence finalize the design dimension. In the standard of throttle unit, to the Reynolds conduit diameter D number writes down ReD, and to the Reynolds D of aperture of reduce expenditure component number writes down Red, both relation is ReD ＝ βRed, the β in type is compared for the diameter of billabong component, namely β ＝ D/D, the attention answers when using.