Abstract: Test and research of rheology for clarified lettuce and celery juice were made using a coaxial cylinder viscome-ter NDJ-79. The rsults indicated that clarified lettuce and celery .juice behaves as a Newdonian fluid. The mathematical models of temperature on viscosity and soluble solids content on viscosity have been founded. Finally, the combined effect of temperture and soluble solids content on viscosity was studied: the mathematical models were derived which described the combined effect of temperature and soluble solids content on the viscosith of lettuce and celery juice over the range of temperature and soluble solids content studied.

Key words: Celery Juice Lettuce Juice Rheology Viseosity Temperature