Transport disengaging height

chemics.transport_disengaging_height.tdh_chan(ug)[source]

Calculate transport disengaging height (TDH) based on the Chan and Knowlton correlation 1. This function is based on the equation presented in the Cahyadi 2 review article

\[TDH = 0.85\,{U_g}^{1.2} (7.33 - 1.2 \log U_g)\]

where \(U_g\) is superficial gas velocity. According to Table 1 in the Cahyadi review paper, this corrleation is relevant for Geldart A and B sand particles with a density of 2595 kg/m³, mean particle size of 37-420 µm, and an inner diameter fluidizing column of 0.3 m.

Parameters

ug (float) – Superficial gas velocity [m/s]

Returns

tdh (float) – Transport disengaging height [m]

Example

>>> tdh_chan(0.3)
1.7587

References

1

I.H. Chan and T.M. Knowlton. The effect of system pressure on the transport disengaging height (TDH) above bubbling gas-fluidized beds. AIChE Symp. Ser., vol. 80, no. 241, 1984.

2

Andy Cahyadi, Anthony H. Neumayer, Christine M. Hrenya, Ray A. Cocco, and Jia Wei Chew. Comparative study of Transport Disengaging Height (TDH) correlations in gas–solid fluidization. Powder Technology, vol. 275, pp. 220-238, 2015.

chemics.transport_disengaging_height.tdh_horio(dc, ug)[source]

Calculate transport disengaging height (TDH) based on the Horio et al. correlation 3. This function is based on the equation presented in the Cahyadi 4 review article

\[TDH = (2.7\, {D_c}^{-0.36} - 0.7) D_c\, \textrm{exp}(0.74\, U_g\, D_c^{-0.23})\]

where \(D_c\) is inner diameter of the fluidizing column and \(U_g\) is superifical gas velocity. According to Table 1 in the Cahyadi review paper, this corrleation is relevant for Geldart group A particles.

Parameters
  • dc (float) – Inner diameter of fluidizing column [m]

  • ug (float) – Superficial gas velocity [m/s]

Returns

tdh (float) – Transport disengaging height [m]

Example

>>> tdh_horio(0.05, 0.3)
0.563

References

3

M. Horio, T. Shibata, and I. Muchi. Design criteria for the fluidized bed freeboard. 4th International Conference on Fluidization in Kashikojima, Japan, 1983.

4

Andy Cahyadi, Anthony H. Neumayer, Christine M. Hrenya, Ray A. Cocco, and Jia Wei Chew. Comparative study of Transport Disengaging Height (TDH) correlations in gas–solid fluidization. Powder Technology, vol. 275, pp. 220-238, 2015.