Pressure Drop Below the Loading Line

The pressure drop Ap/H of irrigated packings for cases al and a2 is given by Eq. (4-48) and/or Eq. (4-49), derived from the channel model  

In the case of random or structured packings with a flow channel angle of 45° (type Y), the following appHes  

A generally valid Eq. (3-8) was derived to calculate the pressure drop of dry, non-irrigated, random and structured packings. 

the resistance coefficient ifr is dependent on the Reynolds number Rey as well as on the type, material, form factor tpp and size of the packing. The numerical values of the form factor (pp used for calculating the resistance coefficient i[f, acc. to Eq. (3-27) and/or for Eq. (4-48), are listed in Tables 6-la-c. 

Based on the constant value of the parameter Cb = 0.4s m, it is possible to verify by calculation 85% of the experimental pressure drop values for irrigated packing elements of any type or size as well as for type Y structured packings (for the latter, the wall factor K = 1 must be substituted into Eq. (4-48) or (4-49), see Chap. 3). The calculation is performed with a relative error of less than 15 %. This was the result of the evaluation of approx. 10000 experimental data items of various systems. The resistance coefficients xf of the tested packing elements for the transition range and the turbulent flow range of the gas phase are listed in Tables 6-la-c. 

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