Rising Film Evaporator
Product Code : LSK-TWL-10808
Rising Film Evaporator (SKU LSK-TWL-10808), also called a vertical long tube evaporator, is a teaching unit for studying how a liquid is concentrated as it boils and climbs as a thin film inside heated tubes. It shows the thermo-siphon principle used in industrial evaporators and reboilers. Chemical engineering heat transfer and unit operations labs use it. Science Lab Supplies manufactures it at its factory at Plot 448, HSIIDC Industrial Area, Saha, Ambala, India, and sells it direct to colleges, tender contractors and distributors.
Specifications
Every technical detail of the evaporator is listed in the table below. In short, it is a vertical shell and tube heat exchanger in which feed enters the bottom of the heating tubes, boils, and is carried upward by its own vapour as a thin, turbulent film on the tube walls.
| Specification | Value |
|---|---|
| SKU | LSK-TWL-10808 |
| Type | Rising film evaporator |
| Also known as | Vertical long tube evaporator |
| Construction principle | Vertical shell and tube heat exchanger |
| Operating principle | Thermo-siphon |
| Flow pattern | Liquid and vapour flow upward in parallel (co-current) |
| Feed entry | Bottom of the heating tubes |
| Film behaviour | Thin film pressed on the tube walls, high turbulence |
| Temperature difference | Rather high between heating and boiling sides, needed to drive the film |
| Product recirculation | Part of the concentrate can return to the feed inlet to keep liquid loading in the tubes |
| Suited products | Highly viscous products and products that tend to foul heating surfaces |
| Manufacturer | Science Lab Supplies, Saha, Ambala, Haryana |
| Country of origin | India |
Applications and Experiments for the Rising Film Evaporator
The unit is used to show how evaporation concentrates a solution and why a rising film suits viscous or fouling products. Students observe that a fairly high temperature difference between heating and boiling sides is needed to drive the film, and relate this to industrial uses from reboilers to solvent recovery.
- B.Tech/B.E. chemical engineering heat transfer lab: operation of a rising film evaporator, after conduction basics on the Thermal Conductivity of Metal Rod.
- Effect of heating-side temperature difference on film formation and concentration.
- Product recirculation to maintain liquid loading in the tubes.
- Process-industry context: effluent treatment, food, pharmaceuticals, desalination and solvent recovery, and reboiler duty, linked to bench work on a Fractional Distillation Assembly.
Evaporators run with hot surfaces and vapour, so operate the unit under supervision and let it cool before handling tubes or fittings.
Standard Scope of Supply
The Rising Film Evaporator is supplied as a single unit as described above; any optional accessories are listed on the quotation. Tell us the solutions you plan to concentrate and the heating medium available in your laboratory, so the quotation matches your experiments.
Packing, MOQ and Lead Time
You can request a quotation for one evaporator or for a full heat transfer lab. Each quotation from Science Lab Supplies states the packing, delivery time and price for the quantity requested, and related heat transfer trainers can go on the same quotation when you source engineering lab equipment in India.
As a registered exporter with an Importer-Exporter Code, Science Lab Supplies can ship to buyers in the UAE, Saudi Arabia, Oman, the Philippines, Nepal and Bangladesh. The business is registered under Udyam as a manufacturing enterprise (UDYAM-HR-01-0014546) and for GST (GSTIN 06ADEPJ0574F2ZU). Enquire through the contact page or the enquiry cart, and use the lab tender page for tender supply.
Frequently Asked Questions
How does a rising film evaporator work?
Feed boils inside vertical heated tubes, and the vapour drives the liquid upward as a thin, turbulent film on the tube walls, concentrating it as it rises.
Which products suit this type of evaporator?
Rising film evaporators suit highly viscous products and products that tend to foul heating surfaces, because the co-current upward flow keeps the liquid film turbulent.
Is Science Lab Supplies the manufacturer or a trader?
Science Lab Supplies is the manufacturer. The evaporator is built at its own factory in Saha, Ambala, India, and quotations come directly from the factory.
Where are rising film evaporators used in industry?
They are mainly used as reboilers for distillation columns, pre-concentrators, flash evaporators and pre-heaters, in fields such as effluent treatment, polymers, food, thermal desalination, pharmaceuticals and solvent recovery.
Related Heat Transfer and Process Trainers
These units sit well beside an evaporator in a heat transfer and process lab. They cover thermal processing of liquids, coiled-tube flow, chilled water, vapour condensing, membrane concentration, extraction and fluid bed heat transfer, linking evaporation with other food and chemical plant operations.
- Laboratory Pasteuriser — benchtop unit with a miniature plate heat exchanger, holding tubes and integral hot water system.
- Flow Through Helical Coil — 15-turn stainless steel coil with rotameter and two manometers.
- Chiller Water Bath — 13 L or 23 L bath cooling from ambient down to as low as -30 °C, with a 15 LPM circulation pump.
- Liebig Condenser — 200 mm borosilicate glass water-cooled condenser for turning vapour back into liquid.
- Reverse Osmosis Ultra filtration Unit — membrane module with RO and UF membranes and a plate heat exchanger.
- Solid Liquid Extraction Unit — semi-batch extraction where the extract solution is evaporated to obtain the product.
- Fluidisation and Fluid Bed Heat Transfer Unit — glass bed chamber with electric heater for heat transfer coefficient studies.
Browse the full Training Workshop Labs range, the Chemistry Lab range for distillation glassware, or all TVET lab equipment.
Last updated: 9 October 2026
