Food-liquid suitability across the concentration path
The feed name opens the discussion. Outlet properties decide whether the proposed system remains workable.
Describe the actual liquid
Identify solids, dissolved sugars, suspended particles, fibres, acidity and any tendency to foam or deposit. Include measurement temperature and the range between batches. A filtered juice and a pulpy purée need different evaluation even when made from the same fruit.
Measure more than inlet viscosity
Provide viscosity against concentration at relevant temperatures. The cold laboratory sample alone may not represent hot operation, while a diluted feed sample does not represent final concentrate. Record the measurement method and shear conditions for non-Newtonian liquids.
Recognise reasons to investigate alternatives
Strong fouling, crystallisation, large particles or a difficult outlet rheology may require a different evaporation concept, pre-treatment or a separate finishing stage. An initial calculation of water removal cannot establish falling-film suitability.
Use a trial to resolve uncertainty
Agree what the sample represents, the intended concentration range, observations of deposition and the quality tests to perform. Translate trial findings into an operating envelope and a cleaning plan rather than one isolated maximum concentration.