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The mathematical model will be able to predict the operated condition  (required tube diameters, heat input and submergence ratio….). That will  result in a successful bubble pump design and hence a refrigeration unit. In  the present work a one-dimensional two-fluid model of boiling mixing  ammonia-water under constant heat flux is developed. The present model is  used to predict the outlet liquid and vapor velocities and pumping ratio for  different heat flux input to pump. The influence of operated conditions such  as: ammonia fraction in inlet solution and tube diameter on the functioning  of the bubble pump is presented and discussed. It was found that, the liquid  velocity and pumping ratio increase with increasing heat flux, and then it  decreases. Optimal heat flux depends namely on tube diameter variations.  Vapour velocity increases linearly with increasing heat flux under designed  conditions

Effect of operating conditions on the performance of the bubble pump of absorption-diffusion refrigeration cycles