###### G

## Grashof Number

The Grashof number (Gr) is the ratio of the buoyancy to the viscous force acting on a fluid. In mass transfer, temperatures will be replaced with concentration.

The Grashof number (Gr) is the ratio of the buoyancy to the viscous force acting on a fluid. In mass transfer, temperatures will be replaced with concentration.

In fluid dynamics, the Graetz number (Gz) characterizes laminar flow in a conduit. It is expressed as: In mass transfer, it is the ratio of momentum diffusivity to mass diffusivity.

Görtler number is the ratio of centrifugal effects to the viscous effects in the boundary layer.

Geldart Group A In the group A class, particles tend to be aeratable and fluidize well. The particle size ranges from 30 micrometers to 125 micrometers in this group. Indeed, most particles used in fluidization are group A powders because they can easily be made by spray drying. Typically, powders Read more…

The general membrane equation is an attempt to state the factors which may be important in determining the membrane permeation rate for pressure-driven processes. It can be expressed as: while

If a positive displacement pump uses interconnecting of gears to pump the fluid then it is known as the gear pump. Gear Pumps are mostly used for hydraulic fluid power applications. Construction A basic gear pump will have a rotary housing containing two or more gears, helical gears. Tight tolerances Read more…