Pressure loss equation

Skin friction loss. Skin friction loss is the loss from the shear forces on the impeller wall caused by turbulent friction. This loss is determined by considering the flow as an equivalent circular cross section with a hydraulic diameter. The loss is then computed based on well-known pipe flow pressure loss equations. 

Basic principles of pneumatic conveying and equations are presented. A new pressure loss equation is presented with examples. 

When the gas compressibility no longer can be bypassed, the pressure loss equation is written in a differential form... 

Some Further Considerations and Development of the Pressure Loss Equation 1347... 

The pressure loss equation (14.113) was derived from the general equation (14.102) by modeling the forces and... 

The new pressure loss equation presented here is based on determining two parameters the velocity difference between gas and conveyed material and the falling velocity of the material. The advantage of this method is that no additional pressure loss coefficient is needed. The two parameters are physically clear and they are quite easily modeled for different cases by theoretical considerations, which makes the method reliable and applicable to various ap>-plications. The new calculation method presented here can be applied to cases where solids are conveyed in an apparently uniform suspension in a so-called lean or dilute-phase flow. 

Draw a pressure traverse for each case in the attached graph, use pressure loss equation given in Data Sheet below. 

Data Sheet. Pressure loss (Equation 4-187) is given by... 

The terms represent, respectively, the effect of pressure gradient, acceleration, line friction, and potential energy (static head). The effect of fittings, bends, entrance effects, etc., is included in the term Ke correlated as a number of effective velocity heads. The inclination angle 0 is the angle to the horizontal from the elevation of the pipe connection to the vessel to the discharge point. The term bi is the two-phase multiplier that corrects the liquid-phase friction pressure loss to a two-phase pressure loss. Equation (23-39) is written in units of pressure/density. 

Antoine equation for vapor pressure of water Oswin equation for material isotherms Drying kinetics equation Belt driver power equation Pressure loss equation... 

Chilton, R. A., and R. Stalnsby. 1998. Pressure loss equations for laminar and turbulent non-Newtonian pipe flow. Journal of Hydraulic Engineering 124, 5 (May), 522 529. 

Govier and Aziz (1972) indicated that once the initial period of stabilization is reached, the general form of pressure loss equations are the same as for time-independent non-Newtonian fluids. At the entry to a pipe, the flow may be laminar, but at a certain distance, once the entrance effects are overcome, the flow can transit to turbulence. 

List the other methods of computing pressure loss. Numerous pressure-loss equations have... 

We may now apply the relation between particle drag and unrecoverable pressure loss, eqn (3.26), to eqns (3.30) and (3.31) to yield the pressure loss equations, applicable over the full expansion range, 1 > e > 0.4 ... 

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