Common application scenarios
Sauces, puree, syrup, plant-based bases, and other viscous liquid foods may need a larger flow path and stronger transfer design than low-viscosity beverage lines. Product behavior is the first selection factor.
Product type guide
Tube-in-Tube UHT Sterilizer for Viscous Foods
A tube-in-tube UHT sterilizer is often discussed for viscous liquid foods where product flow, pressure drop, fouling behavior, and gentle sanitary transfer need careful engineering review.
Confirm that the proposed flow path can handle viscosity, particles, shear sensitivity, pressure drop, fouling, and cleaning within documented operating limits.
Technical overview
Can tube-in-tube flow and heat transfer handle this product?
Process risks to check early
Engineering review should cover viscosity at process temperature, particle size, shear sensitivity, pump selection, heating uniformity, holding design, cooling duty, cleaning time, and likely fouling points.
Integration questions
Tube-in-tube UHT lines may require careful coordination with upstream mixing, deaeration, homogenization if used, buffer tanks, aseptic filling, and CIP return flow so the complete line operates predictably.
Selection boundary
Specify viscous and particulate products at process temperature
Room-temperature descriptions are not enough. Flow behavior, particle integrity, pumping, heat transfer, and cleaning must be evaluated under the proposed process conditions.
| Geometry definition | Confirm that “tube-in-tube” refers to the quoted concentric arrangement and identify whether product flows in the inner tube or annulus. Record the minimum passage, diameters, heating-medium path, removable sections, and expansion allowances. |
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| Rheology and particles | Provide viscosity versus temperature, particle dimensions and concentration, solids content, yield behavior, and whether the product is shear sensitive. |
| Pumping | Confirm pump type, differential pressure, slip or pulsation controls, startup product loss, and the lowest stable production rate. |
| Thermal uniformity | Ask how velocity profile, residence-time distribution, wall temperature, holding section, and cold-spot risk are handled for the quoted product. |
| Fouling and cleaning | Define expected run length, product recovery, CIP flow criteria, difficult-to-clean sections, inspection access, and criteria for a repeat cycle. |
| Line integration | Freeze mixer, deaerator, buffer, filler, valve, transfer-pressure, sterile-boundary, and controls responsibilities before purchase. |
Inquiry checklist
Rheology and particle data for tube-in-tube review
- Viscosity at room and process temperature
- Particle size, pulp, fiber, or suspended solids
- Pump type and pressure drop expectations
- Holding tube and cooling section requirements
- CIP program for residue-heavy formulas
Buyer questions
Tube-in-tube UHT questions to resolve before quotation
When should I choose tube-in-tube UHT?
Choose it for review when the product is more viscous, contains pulp or suspended solids, or needs a larger sanitary flow path than a plate exchanger can provide.
Can tube-in-tube UHT process sauce?
It can be configured for some sauces and purees, but viscosity, particles, heat sensitivity, and fouling risk must be reviewed before quotation.
Why is viscosity important?
Viscosity affects pumping, pressure drop, heat transfer, holding accuracy, cleaning difficulty, and whether the selected exchanger can run stably.
What sample information is useful?
Provide formula notes, viscosity at relevant temperatures, particle size and concentration, target shelf life, package and storage conditions, target market, capacity, cleaning constraints, utilities, and who validates the final process.