Engineering
Pump Power Calculation @ Neutrium.net
September 7, 2012Power is consumed by a pump, fan or compressor in order to move and increase the pressure of a fluid. The power requirement of the pump depends on a number of factors including the pump and motor efficiency, the differential pressure and the fluid density, viscosity and flow rate. This article provides relationships to determine the required pump power.
Converting Between Cv, Kv and K @ Neutrium.net
August 27, 2012There are several common ways to express the losses caused by pipe fittings and equipment. Depending on the calculation programs or methods available and engineer may require to convert between one form or another. This article details the equations required to convert between the resistance coefficient and flow coefficient methods (K, Cv and Kv).
Properties of Air @ Neutrium.net
August 24, 2012This article contains formulae and tabulated data for the properties of air as a function of temperature.
Cavitation in Restriction Orifices and Valves @ Neutrium.net
August 17, 2012Restriction orifices and control valves are commonly used for pressure reduction and measurement of flow rates, however for a liquid system, excessive pressure drop across these items of equipment may result in cavitation. This article describes methods of predicting cavitation across restriction orifices and valves and proposes designs which may be used to avoid cavitation.
Reynolds Number @ Neutrium.net
August 4, 2012The Reynolds number is dimensionless and describes the ratio of inertial forces to viscous forces in a flowing fluid. It is used in many fluid flow correlations and is used to describe the boundaries of fluid flow regimes (laminar, transitional and turbulent). This article will show you how to calculate and interpret the Reynolds number.
Viscosity @ Neutrium.net
July 30, 2012Viscosity is a measure of a fluids propensity to flow. There are two kinds of viscosity commonly reported, kinematic and dynamic. Dynamic viscosity is the relationship between the shear stress and the shear rate in a fluid. The Kinematic viscosity is the relationship between viscous and inertial forces in a fluid. Most common fluids are Newtonian fluids and their viscosity is constant with shear stress and shear rate. Non-Newtonian fluids are less common.
Pressure Loss from Fittings in Pipe Summary @ Neutrium.net
July 23, 2012Fittings such as elbows, tees, valves and reducers represent a significant component of the pressure loss in most pipe systems. This article discusses the differences between several popular methods for determining the pressure loss through fittings. The methods discussed for fittings are: the equivalent length method, the K method (velocity head method or resistance coefficient method), the two-K method and the three-K method. In this article we also discuss method for calculating pressure loss through pipe size changes as well as control valves.
Pump Affinity Laws @ Neutrium.net
July 16, 2012The pump affinity laws allow the prediction of centrifugal pump performance given changes to the speed of the pump or the diameter of impeller. This article presents the pump affinity laws for reference.
A Robust Monte Carlo Based Ray-Tracing Approach for the Calculation of View Factors in Arbitrary 3D Geometries
July 1, 2012Proceedings of CHT-12 ICHMT International Symposium on Advances in Computational Heat Transfer, Bath, England, 2012, Pages 1607-1629
Packed Bed Reynolds Number @ Neutrium.net
June 25, 2012The packed bed Reynolds number is dimensionless and describes the ratio of inertial to viscous forces for fluid flow through a packed bed. It may be used to calculate the pressure drop though a packed bed via the Ergun equation or identify the boundaries of flow regimes (laminar, transitional and turbulent) in a packed bed. This article will show you how to calculate and interpret the packed bed Reynolds number.