Pasteurization requires that the milk is in custody for a specified time. The appropriate length for the holding tube can be calculated by the flow rate (Q) of milk and the diameter (D) of the holding tube using the formula:
Length of holding tube, L = Q x holding time/A x η
Length of holding tube, L = Q x holding time/A x η
A = Area = pi/4 x sqr D
Where an efficiency factor, η, of 0.85 is used in the model.
Where an efficiency factor, η, of 0.85 is used in the model.