We thank Dr. Yu for his discussion on two papers 1,2 of ours on thermal dispersion in porous media that appeared in the Journal of Heat Transfer. Dr. Yu rewrites our correlations established performing a series of numerical experiments as follows:

For the transverse dispersion:  
kdisyykf=0.022PeD1.71ε1/4forPeD<10
(26a)
 
kdisyykf=0.0521ε1/2PeDforPeD>10
(26b)
For the longitudinal dispersion:  
kdisxxkf=0.022PeD21εforPeD<10
(16a)
 
kdisxxkf=2.7PeDε1/2forPeD>10
(16b)
Dr. Yu assumes that the thermal dispersion decreases with the increase in the porosity, for it vanishes when...
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