Reynolds Apparatus
Product Code : EL-FML-11037
Quick answer: The Reynolds Apparatus (EL-FML-11037) is a fluid mechanics lab set-up for Reynolds' dye experiment. A thin stream of dye is injected into water flowing through a borosilicate glass tube, so students can see laminar, transitional and turbulent flow and calculate the Reynolds number. Lab Exports manufactures it in Delhi for engineering colleges, polytechnics and TVET institutes.
Specifications
| Component | Specification |
|---|---|
| Test tube | Borosilicate glass, bell-mouth entrance from the water tank |
| Dye vessel | Stainless steel or copper, with capillary dye tube on the tube axis |
| Constant head tank | 40 litre |
| Sump tank | 60 litre |
| Water circulation | FHP pump |
| Flow control | Cock at the outlet end of the glass tube |
| Flow measurement | Measuring cylinder and electronic stop watch |
| Control panel | Standard make, On/Off switch & mains indicator |
| Structure | Painted steel frame |
How the Reynolds experiment is done
The Reynolds number, Re = rho v D / mu (or v D / nu), compares inertial forces with viscous forces in a flowing fluid. In a circular pipe, flow is usually laminar below about Re 2000, turbulent above about Re 4000, and transitional in between. The apparatus lets students see these regimes directly and link each one to a measured Reynolds number.
- Fill the constant head tank and let the water settle so that there are no disturbances at the bell-mouth entrance.
- Open the outlet cock slightly and release dye through the capillary tube; at low flow the dye forms a straight, unbroken thread along the tube axis.
- Collect water in the measuring cylinder for a timed interval to find the discharge, then work out the mean velocity from the tube cross-section.
- Increase the flow in steps and note where the dye thread starts to waver and where it breaks up and mixes across the whole tube.
- Calculate the Reynolds number for each flow rate using the water temperature to find its kinematic viscosity, and compare the values with the flow pattern seen.
A table of discharge, velocity, Reynolds number and observed flow type is the usual result, and the class can compare its transition values with the textbook limits.
Key features
- Borosilicate glass test tube with a bell-mouth entrance for a smooth, disturbance-free inlet.
- Capillary dye injection on the tube axis, so the dye thread shows the flow pattern clearly.
- 40-litre constant head tank that keeps the supply steady while readings are taken.
- Closed-loop circulation from a 60-litre sump with an FHP pump, so the set-up runs stand-alone.
- Outlet cock for fine control of the flow rate, with discharge measured by cylinder and stop watch.
Documentation and supply
Installation instructions and a manual are supplied with the apparatus. Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the Reynolds apparatus at its works in Laxmi Nagar, Delhi, and supplies it to engineering colleges, polytechnics and TVET institutes in India and 60+ countries, handling the export documents for each shipment. More about the company is on the About Lab Exports page.
Related Fluid Mechanics Lab products
- Bernoulli Theorem Apparatus (EL-FML-11038)
- Discharge Over Notches Apparatus (EL-FML-11039)
- Venturimeter Orificemeter Calibration Set Up (EL-FML-11040)
- Study of Pipe Fitting (EL-FML-11041)
- Friction in Pipe Lines Apparatus (EL-FML-11042)
- Impact of Jet on Vanes Apparatus (EL-FML-11043)
The full range is in the Fluid Mechanics Lab section of the Engineering Lab range.
Frequently asked questions
What does the Reynolds apparatus demonstrate?
It shows laminar, transitional and turbulent flow in a glass tube and lets students relate each flow type to its Reynolds number.
What are the tank capacities?
The constant head water tank holds 40 litres and the sump tank holds 60 litres.
What services are needed to run it?
A water supply and a drain connection are needed, along with mains power for the FHP pump.
What is the price of the Reynolds apparatus?
Prices are not published on the website. Add the Reynolds apparatus to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code EL-FML-11037 and the quantity, to receive a quotation.
Does Lab Exports manufacture the Reynolds apparatus?
Yes. Lab Exports manufactures the Reynolds apparatus at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code EL-FML-11037.
Request a quote
Email [email protected] with the house code EL-FML-11037 and the quantity, or add the Reynolds apparatus to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
