Michell Pad Apparatus

Product Code : SLE/ETM/14
  • A bench mounted, self contained apparatus to demonstrate the pressure distribution across the film of oil in a Michell tilting pad slider bearing. 
  • The bench-mounting unit has an aluminium plate (pad) mounted above a continuous loop flat belt. 
  • This creates a pressurised film of oil between the pad and the belt. 
  • A set of thirteen graduated tubes show the oil pressure across and along the film under the pad. 
  • Micrometers measure the leading and trailing edge positions of the pad.
  • Two eccentric shafts hold the pad so students can adjust the angle of tilt of the pad. 
  • This helps students to find the relationship between pressure distribution and film thickness. 
  • Included is a variable speed control to control the speed of the motor that turns the belt.  
  • Included with the apparatus is a container of oil and a viscometer to measure the viscosity of the oil.
  • Students vary the belt speed to find the relationship between sliding speed, oil viscosity and pressure distribution.

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Coriolis Force

Product Code : SLE/ETM/15
  • A benchtop base unit supporting a rotating arm on which a transparent water tank and counterbalance are mounted.
  • The jet of water is observed to deflect when the arm rotates.
  • The water tank houses a submersible pump which produces a jet of water. 
  • Dials and a digital display on the base unit allow students to adjust the speed and direction of rotation, as well as the pump rate.
  • The deflection is due to the Coriolis force, a fictitious force which appears to act on objects moving within a frame of reference that is rotating.

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Two Stage Compressor Test Set

Product Code : SLE/EA/09
  • A self-contained mobile two-stage reciprocating air compressor test set to allow investigations into the operation and performance of compressors with a single-stage, two stages and two stages with inter-cooling. 
  • Electronic drive units independently control both motors. 
  • Meters show motor electrical power consumption of each motor. 
  • A close-coupled load cell on each motor measures torque. 
  • A sensor on each motor measures speed, shown by a digital indicator. 
  • The product of the torque and speed gives true shaft power.
  • All controls and instrumentation are on an easy-to-operate mimic panel.
  • This test set has two independently-controlled, motordriven compressors, intercooler and air receiver. 
  • It works as a single-stage, two-stage or two-stage compressor with intercooler. 
  • Electric motors and low-maintenance toothed belts drive two twin-cylinder, air-cooled reciprocating compressors. 
  • To allow students to study different types of air-compressor systems, diverter valves allow air to move in different directions. 

These include:

  • From the first stage to the receiver.
  • Directly to the second stage.
  • To the second stage, by means of the integral water-cooled intercooler.
  • Independent control of the two compressor speeds allows flexibility to match the two compressors under different conditions. 

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Emissivity Natural Convection And Radiation

Product Code : SLE/EA/10
  • The Natural Convection and Radiation equipment allows the study of heat transfer at different pressures and vacuum. It shows the differences between radiation and natural 'free' convection. 
  • A small heated element hangs in the centre of a pressure vessel. 
  • Students can extrapolate the results down to a total vacuum (no convection). 
  • This allows them to isolate the heat transfer by radiation.
  • The heater has a matt black surface. 
  • Attached to its surface is a thermocouple to measure the temperature. 
  • The vessel’s inside is also black, and it has a thermocouple fitted to its wall to measure the temperature in the vessel. 
  • It allows students to find the emissivity of a surface and verify the Stefan-Boltzman equation. 
  • It also gives students an understanding of the non-dimensional characteristics using Nusselt, Grasof, Prandtl and Knudsen numbers.
  • The vessel may be charged with compressed air up to 1 bar (gauge) or evacuated down to about 5 Pa (absolute).
  • Instruments and a digital display measure and display the temperatures, pressures and power to the element. 
  • To give accurate measurements of pressure and vacuum, the equipment has two different pressure transducers - one for pressures above atmospheric and one for pressures below atmospheric.

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Film wise And Dropwise Condensation And Boiling

Product Code : SLE/EA/11
  • Heating and condensing takes place inside a partially filled glass vessel. 
  • A heater coil heats the water.
  • The temperature of the wire reaches significantly higher than 100°C.
  • Students watch the boiling process and note the different boiling processes.
  • For boiling heat transfer experiments, students adjust the current in a resistant wire heater element in the water.  

These include:

  • Subcooled boiling: where small bubbles form and rise.
  • Nucleate boiling: where large bubbles form and rise.
  • Film boiling: unstable and stable, where a vapour blanket forms and heat transfer by radiation becomes important.
  • For condensing heat transfer experiments, water condenses on two water-cooled vertical cylinder specimens. 
  • The cooling water flow rate and its temperature change at each cylinder helps students to find the heat transfer.

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Temperature Measurement and Calibration Apparatus

Product Code : SLE/EA/12
  • The Temperature Measurement and Calibration apparatus fits on a desk or bench top. 
  • It includes eight different temperature measurement devices and shows their characteristics and how to calibrate them against a standard. 
  • A carefully rated immersion heater in the tank heats the water steadily up to boiling, giving time to take accurate results. 
  • The built-in precision reference sensor works as an accurate temperature reference. 
  • A display shows the temperature from the reference sensor and the local pressure from the built-in pressure sensor. 
  • The display also calculates the local boiling point of water based on the barometric pressure. 
  • Students add crushed ice to the insulated icebox and clean water to the fully guarded water heater tank. 
  • The water heater tank has a drain tap for connection to a suitable container or local water drain. 
  • This helps students to change the heated water safely and quickly, reducing experiment time.
  • The water heater tank includes a water level float switch and a safety temperature cut-out switch to turn off the heater in case of low water level. 

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Jacketed Vessel and Coil 

Product Code : SLE/EA/13
  • This heat exchanger mimics those used in the process industry. 
  • The unit has an extra thermocouple to measure the batch temperature. 
  • It also has a motorised stirrer to show how stirring affects heat transfer. 
  • Continuous feed to the vessel for heating or you set a fixed batch for heating.
  • It can show heat transfer by using the outer skin (or ‘jacket’) of the vessel, or by a coil inside the vessel.
  • All fluid connections between the Service Module and the heat exchanger are self-sealing quick connectors – for safety and simplicity. 
  • The hot and cold fluid streams have different connectors to reduce errors.   

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Shell and Tube Heat Exchanger

Product Code : SLE/EA/14
  • This heat exchanger is one of the most common type used in industry. 
  • This is because it is compact, but can work at higher pressures than other designs. 
  • It is a large tube which surrounds several smaller tubes (a bundle). 
  • Baffles around the bundle help to create a turbulent mixed flow. 
  • One fluid passes through the shell, and the other fluid passes through the tube bundle, therefore transferring heat.

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