Can the gas-liquid contact heat transfer coefficient be calculated?

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Air spray is used in the desulfurization tower. I would like to calculate the relationship between the moisture content in the flue gas and the liquid-gas ratio. I found a calculation method for determining the wet-bulb temperature, which can be used to calculate the rate of moisture vaporization; thereafter, the humidity of the flue gas exiting the tower can be determined using the trial-and-error method: Gw = kH * A *(HW – H), where GW represents the rate of moisture vaporization in kg/s, kH is the mass transfer coefficient driven by the humidity difference, and A is the mass transfer area. However, I’m not sure how to determine the values of A and kH in this formula. Also, I’m not certain whether this formula is appropriate. I really can’t find any other calculations related to this topic; I hope someone with more expertise can offer some guidance