On the basis of laminar and turbulent theory

mathematical model was presented about aqua ammonia falling film absorption performance

and theoretical formula of ammonia absorption rate for aqua ammonia was deduced. This formula indicated two methods which can improve ammonia absorption rate

namely sprinkle density of aqua ammonia outside tube and ammonia solubility of aqua ammonia. When sprinkle density of aqua ammonia increased from 615 kg·m-1·h-1 to 3191 kg·m-1·h-1

ammonia absorption rate rose by 220%. In winter the aqua ammonia absorption experiments using 2# tube were carried out under absorption pressure of 0.15 MPa. When average temperature of aqua ammonia increased from 25℃ to 34℃

ammonia absorption rate decreased by 130%.In summer the aqua ammonia absorption experiments using 2# tube were carried out under absorption pressure of 0.25 MPa. When average temperature of aqua ammonia increased from 35℃ to 50℃

ammonia absorption rate decreased by 86%.An important parameter having influence on transversally grooved tube (TGT) falling film absorption performance is comprehensive impact factor of groove size i.e.e2/pd. Choosing this comprehensive impactfactor and falling film Reynolds number as independent variable

the correlation equation of Sherwood number was established for ammonia solution falling film absorption outside tube.