Ergun’s law

Thonglimp s equation estimates the minimum particle fluidisation velocity and the particle entrained height and Ergun s law approximates the pressure drop across the filter. Darcy s law predicts the gas flowrate distribution through out the filter. 

Applying Ergun s law for calculating the pressure drop in each of these two parallel average flow channels... 

For packed-bed and turbulent flows, Darcy s law can be rewritten as the Ergun equation (9) ... 

For calculating one-dimensional flow behavior in a packed bed, the Ergun equation is generally sufficient. For single-phase, constant-density flow in two or three dimensions, Darcy s law can be substituted into the continuity equation (V v = 0) and simplified to obtain the Laplace equation ... 

Empirical relationships are generally used to relate the rate of change of pressure with position and time to the local gas velocity in PSA processes, or to determine the pressure drops in TSA processes. The Ergun equation or Darcy s law are often used to... 

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