Viscosity and Particle Drag
Product Code : LSK-FM-10459
Viscosity and Particle Drag apparatus (SKU LSK-FM-10459) is a simple falling-sphere viscometer: a sphere is timed as it falls a set distance through a test fluid to find viscosity and study the drag on particles. Two glass tubes allow side-by-side comparison of fluids in engineering and applied science labs. Science Lab Supplies manufactures this viscometer itself at Plot 448, HSIIDC Industrial Area, Saha, Ambala, India, and the unit can be quoted from there to colleges, polytechnics, tender contractors and distributors.
Specifications
For the twin-tube falling-sphere viscometer, each specification sits on its own row. In short, a self-standing unit holds two glass tubes of test fluid in front of a low-voltage backlight, and a valve at each tube base drops the sphere into a collection vial, limiting fluid loss; wetted parts are glass and PTFE.
| Specification | Value |
|---|---|
| SKU | LSK-FM-10459 |
| Type | Simple falling-sphere viscometer |
| Unit | Self-standing |
| Test tubes | Two glass tubes, for comparing fluids |
| Lighting | Low-voltage backlight on the back plate |
| Sphere recovery | Valve at the tube base drops the sphere into a collection vial |
| Valve function | Minimises fluid loss and helps draining after tests |
| Timing | Stopwatch (included), over a set fall distance |
| Suitable fluids | Water, thin machine oil, castor oil, motor oil |
| Wetted parts | Glass and PTFE |
| Own test shapes | Maximum 8 mm in any single dimension (must pass the valve) |
| Manufacturer | Science Lab Supplies, Saha, Ambala, Haryana |
| Country of origin | India |
Applications and Experiments for the Viscosity and Particle Drag Apparatus
The apparatus measures the terminal velocity of spheres in liquids, from which viscosity follows by Stokes' law, and shows how particle size, density and shape affect drag. Suitable fluids include water, thin machine oil, castor oil and motor oil, and spheres are chosen to suit the density and size needed for each fluid.
- B.E./B.Tech mechanical and chemical: coefficient of viscosity by the falling-sphere method, compared with the timed capillary flow of an Ostwald Viscometer.
- Comparing two fluids at once in the twin tubes.
- Drag on non-spherical shapes made by students, up to 8 mm.
- B.Sc. physics and diploma practicals: Stokes' law and terminal velocity, with very viscous liquids also measured on the Viscometer Searle's Pattern.
Standard Scope of Supply
The unit comes with its two glass tubes, backlit back plate, base valve with collection vial, and a stopwatch. The laboratory chooses and fills the test fluids; the quotation confirms the test spheres supplied. Use only fluids that can be handled safely and are compatible with glass and PTFE.
Packing, MOQ and Lead Time
Order one viscometer for a demonstration or several for parallel groups; each quotation gives packing, delivery time and price for that number. Other engineering lab equipment in India from our fluid mechanics section can be combined on the same quotation.
Having an Importer-Exporter Code as a registered exporter, Science Lab Supplies can ship to buyers in the Philippines, Nepal, Bangladesh, Zambia, Rwanda and South Africa. Say how many viscometers you need in a note on the contact page, or add them to the enquiry cart; tender documentation is handled through the lab tender page.
Frequently Asked Questions
Which fluids can be tested?
Water, thin machine oil, castor oil and motor oil are suitable, and so is any fluid that can be handled safely and is chemically compatible with the glass and PTFE wetted parts.
How are the spheres recovered?
When a sphere reaches the bottom, the valve is turned and the sphere drops into a collection vial. The valve keeps fluid loss low, so the tubes need draining and refilling less often.
Is Science Lab Supplies the manufacturer or a trader?
The twin-tube viscometer is a Science Lab Supplies product from its Saha, Ambala factory in India, which means your enquiry about it is answered by the maker rather than passed through an agent.
Can students test their own shapes?
Yes. Students may make their own shapes and drop them through the test fluid, provided each one fits through the base valve, which allows a maximum of 8 mm in any single dimension.
Related Viscosity, Settling and Flow Equipment
Viscosity and particle drag link to several other practicals in the Fluid Mechanics, Training Workshop Labs and Physics Lab ranges: a bench with its own falling-sphere viscometer, settling columns and sedimentation studies, laminar and turbulent pipe flow, flow visualisation and a timer. They can be quoted together.
- Hydrostatics And Properties of Fluids — falling-sphere viscometer and specific-gravity bottle among its fluid-property items.
- Liquid Sedimentation Apparatus — five backlit transparent columns, supplied with a stopwatch and specific gravity bottle.
- Sedimentation Studies Apparatus — separation of solids from fluids under gravity, with terminal velocity of particles.
- Friction Loss In A Pipe — thermometer supplied; a header tank feeds the pipe for low flow rates.
- Reynolds Apparatus — dye fed through polythene tubing into a borosilicate glass tube.
- Flow Visualisation Channel — stainless steel settling tank reduces turbulence before the channel.
- Digital Stopwatch — 1/100 s timer with alarm, also showing time and date.
Browse the full Fluid Mechanics range, the Elasticity and Surface Tension range, or all engineering laboratory equipment.
Last updated: 22 October 2026
