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Pressure measuring points are located in the region of the curvature on both sides: four on the left side and five on the right side. The pressure measuring points are connected to the tube manometers in via the hoses supplied. The experimental unit when used in the aerodynamics trainer, allows the measurement of the static pressure at 29 pressure measuring points along the pipe bend. The transparent pipe bend has a constant rectangular cross-section with 10 pressure measuring points each on the top and bottom. The static pressures can be read on the tube manometers. The pressure curve during a change in the flow direction is investigated using the example of a 90 pipe bend. When laying pipes it is essential that they are adapted to the circumstances of their environment, which means the pipes will necessarily include deflections in the form of bends. Changing the direction of flow in a pipe changes the pressure conditions.
Learning Objectives And Experiments:
Determination of the static pressure at 29 pressure measuring points
Representation of the pressure distribution
Investigation of the pressure curve at a 90 pipe bend.
Two duct support stands are provided (only one is shown in the picture) and the experiments require the use of a necessary accessory, the Multitube Manometer. The equipment comprises additional sets of ductwork manufactured in aluminium containing both pressure tappings and pitot static tube points together with a set of inlet adaptors which can be connected to the intake of the fan by means of deep spigoted sockets with O ring seals and over-centre toggle latches.
Items of ductwork comprise:
The graph shows typical results which can be obtained when measuring duct entry pressure.
65 mm dia. inlet duct with sudden transition to 95 mm dia. incorporating six static pressure tappings.
65 mm dia. bellmouth intake adaptor.
95 mm dia. by 1400 mm long section with six static pressure tappings, together with a pitot static mounting pad.
65 mm dia. bluff intake adaptor.
95 mm dia. by 1400 mm long section with a static pressure tapping and a pitot static mounting pad.
Multi-channel peristaltic pump for conveying the product and the indicator reagents
Injection valve, injection syringe and injection loop for adding the enzyme GOD required for verification
Continuous, photometric determination of the glucose concentration in the product
PTFE flow cell for determining the concentration with the photometer
3 DURAN glass beakers for indicator reagents and GOD
2 PTFE reaction loops
1 tank for waste
2 mixing chambers for mixing the product and indicator reagents.
Flow measurement by rotameter with electrical output
Generation of disturbance variables by ball valves with scale
Tank with overflow and scale
Experimental unit for control engineering experiments
Level and flow control individually, and cascaded
Large process schematic on front panel
Key process variables accessible as analogue signals at lab jacks
Level measurement by pressure sensor
Control valve: electromagnetic proportional valve
2 digital industrial controllers, parameterisable as P, PI or PID controllers, cascade.
The fan inlet and outlet ports are designed to accommodate standard duct sections of 146 mm Of aluminum diameter and comprising sleeves Sealed by O-rings and tightened by Snap closures with quick disassembly. All these sections conform to the Standards.
65 mm nozzle at the inlet of the 146 mm duct diameter
65 mm diaphragm at the inlet of the 146 mm diameter
95 mm diaphragm at the inlet of the 146 mm diameter
Venturi nozzle of 95 mm-146 mm diameter Pitot tube and through mechanism
To install additional measuring devices, two Sections and a supporting device are included :
Section 1000 mm long and 146 mm in diameter, Comprises a honeycomb flow rectifier and three fasteners For the Pitot tube.
146 mm diameter input adapter, Includes measuring points for diaphragm or Venturi trunk.
The flow measuring instruments are connected in series and all except the measuring tank are arranged on a water proof panel. The pressure drop is measured by deferential pressure using manometers. Pressure tapping is by valves with quick connection. Flow Measurement Test Set is a bench top self contained water circulating unit for studying the various flow measuring instruments including primary flow measuring devices. Flow rate is obtained from a water meter reading and a stop watch. Water tanks are behind the panel. Flow rate is varied by a flow control valve. Measurement of flow by a primary flow measuring devices is by coefficient of discharge which is determined from a pressure drop across the device and a flow rate.
Experiments:
Determination of coefficients of discharge for Venturi meter, orifice meter and Pitot tube and compare the flow rates with those from water meter, variable area flow meter and measuring tank.
Comparison of differential pressure at various flow rates for Venturi meter, orifice meter, Pitot tube, and variable area flow meter.
The nozzle flow meter or any of the optional flow meters quickly andeasily fit into place between the adaptors in the base unit of the apparatus. For use by all kinds of engineering students, the Flow Meter Calibration apparatus compares and shows the accuracy and use of fundamental flowmeters. The manometers have a common manifoldfitted with an air valve. Students use the hand-pump to increase the air pressurein the manifold. The straight pipe gives a comparison of the true pressurelosses caused by the flow meters. Four water filled manometers show the pressure differences at the flow meterand across the overall flow meter assembly. This helps to explain the boundary layerand surface friction in pipes and flow channels. The optional Pitot Tube Flow Meter will alsoshow the velocity profile in a pipe.
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Flow Meter Demonstration
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Flow Meter Demonstration Unit is a self-contained apparatus to demonstrate the attributes of flow meters utilized in measurement of water flow via pipes or open channels. Metering devices available in different combinations to suit coursework. Reference turbine flowmeter permanently fitted. Service module with reservoir, volumetric measuring tank & pump.
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2 measuring locations for vertical or horizontal installation of the flow meters under test
Electromagnetic flow rate sensor for reference measurement
Comparison and calibration of different flow meters
DC voltage source to supply the flow meters with auxiliary power
Flow meters available as accessories
Water circuit with tank, pump and valve to adjust flow rate
1 differential pressure sensor and twin tube manometers for measurement of pressure losses.
Transparent, graduated (metric system) column, shatter resistant polymer certified for medical use.
Graduation shall have over 270 degrees of visibility.
Thorpe tube design flow meter using DISS input connector for panel /regulator mounting.
Pressure compensated design to give specified accuracy for whole range of input pressures
Built-in inlet filter (depending on supplied model).
Inlet and outlet connectors DISS style, other types of connectors available upon request
Can be cleaned with damp cloth and a disinfection solution.
Needle valve and body constructed of brass or aluminium.
Calibrated at 50-55 psi / 345-380 kPa / 3.4-3.8 bar inlet gauge pressure.
Inlet pressure (nominal) > 50 psi (345 kPa / 3.45 bar), peak inlet pressure at least 100 psi (690 kPa / 6.89 bar).
Maximum flow rate when fully opened: 50 L/min (depending on supplied model).
Medical gas flow meter (Thorpe tube design) to regulate and measure the flow rate of medical gas supplied to a patient, maximum flow rate 15 LPM, for medical oxygen.
Graduation shall have over 270 degrees of visibility.
Needle valve and body constructed of brass or aluminium.
Calibrated at 50-55 psi / 345-380 kPa / 3.4-3.8 bar inlet gauge pressure.
Inlet pressure (nominal) > 50 psi (345 kPa / 3.45 bar), peak inlet pressure at least 100 psi (690 kPa / 6.89 bar).
Pressure compensated design to give specified accuracy for whole range of input pressures
Thorpe tube design flow meter using DISS input connector for panel /regulator mounting.
Can be cleaned with damp cloth and a disinfection solution.
Transparent, graduated (metric system) column, shatter resistant polymer certified for medical use.
Built-in inlet filter (depending on supplied model).
Maximum flow rate when fully opened: 50 L/min (depending on supplied model).
Adjustment knobs to have rough surface to prevent slipping.
Inlet and outlet connectors DISS style, other types of connectors available upon request.
Medical gas flow meter (Thorpe tube design) to regulate and measure the flow rate of medical gas supplied to a patient, maximum flow rate 3.5 LPM, for medical oxygen.
Transparent, graduated (metric system) column, shatter resistant polymer certified for medical use.
Graduation shall have over 270 degrees of visibility.
Needle valve and body constructed of brass or aluminium.
Inlet and outlet connectors DISS style, other types of connectors available upon request
Thorpe tube design flow meter using DISS input connector for panel /regulator mounting.
Can be cleaned with damp cloth and a disinfection solution.
Calibrated at 50-55 psi / 345-380 kPa / 3.4-3.8 bar inlet gauge pressure.
Inlet pressure (nominal) > 50 psi (345 kPa / 3.45 bar), peak inlet pressure at least 100 psi (690 kPa / 6.89 bar).
Maximum flow rate when fully opened: 50 L/min (depending on supplied model).
Pressure compensated design to give specified accuracy for whole range of input pressures
Built-in inlet filter (depending on supplied model).
Adjustment knobs to have rough surface to prevent slipping.
Medical gas flow meter (Thorpe tube design) to regulate and measure the flow rate of medical gas supplied to a patient, maximum flow rate 5 LPM, for medical medical air.
Graduation shall have over 270 degrees of visibility.
Needle valve and body constructed of brass or aluminium.
Pressure compensated design to give specified accuracy for whole range of input pressures.
Thorpe tube design flow meter using DISS input connector for panel /regulator mounting.
Can be cleaned with damp cloth and a disinfection solution.
Transparent, graduated (metric system) column, shatter resistant polymer certified for medical use.
Calibrated at 50-55 psi / 345-380 kPa / 3.4-3.8 bar inlet gauge pressure.
Inlet pressure (nominal) > 50 psi (345 kPa / 3.45 bar), peak inlet pressure at least 100 psi (690 kPa / 6.89 bar).
Medical gas flow meter (Thorpe tube design) to regulate and measure theflow rate of medical gas supplied to a patient, maximum flow rate 5 LPM,for medical oxygen.
Transparent, graduated (metric system) column, shatter resistant polymer certified for medical use.
Graduation shall have over 270 degrees of visibility.
Needle valve and body constructed of brass or aluminium.
Thorpe tube design flow meter using DISS input connector for panel /regulator mounting.
Can be cleaned with damp cloth and a disinfection solution.
Inlet and outlet connectors DISS style, other types of connectors available upon request
Adjustment knobs to have rough surface to prevent slipping.
Calibrated at 50-55 psi / 345-380 kPa / 3.4-3.8 bar inlet gauge pressure.
Inlet pressure (nominal) > 50 psi (345 kPa / 3.45 bar), peak inlet pressure at least 100 psi (690 kPa / 6.89 bar).
Pressure compensated design to give specified accuracy for whole range of input pressures.
Medical gas flow meter (Thorpe tube design) to regulate and measure theflow rate of medical gas supplied to a patient, maximum flow rate 8 LPM,for medical oxygen.
Graduation shall have over 270 degrees of visibility.
Needle valve and body constructed of brass or aluminium.
Calibrated at 50-55 psi / 345-380 kPa / 3.4-3.8 bar inlet gauge pressure.
Inlet pressure (nominal) > 50 psi (345 kPa / 3.45 bar), peak inlet pressure at least 100 psi (690 kPa / 6.89 bar).
Pressure compensated design to give specified accuracy for whole range of input pressures
Built-in inlet filter.
Thorpe tube design flow meter using DISS input connector for panel /regulator mounting.
Can be cleaned with damp cloth and a disinfection solution.
Transparent, graduated (metric system) column, shatter resistant polymer certified for medical use.
Maximum flow rate when fully opened: 50 L/min.
Inlet and outlet connectors DISS style, other types of connectors available upon request
Adjustment knobs to have rough surface to prevent slipping.
Flow Networks system reproduces the problem that usually appears in pressure and flow calculation in pipes that generally have different diameters, lengths and are interconnected; these systems of pipes (in series, parallel or meshed) can complicate the pressure and flow calculation. The flow measurements can be done using the volumetric reservoir of the hydraulic bench (required and not included in this item) and it allows also the study of the relationship between pressure drop and fluid velocity. The module is made of some transparent tubes with different diameters, and it includes a number of valves placed in specific points of the network. The quick couplings used in this system enable fast and easy exchange of pipes creating therefore several network configurations. These pipes interconnections are known as flow networks. For example, a water-supply network of a town or the fire-protection system in a building can be considered as flow networks. With this module, students can perform experiments that can simulate the behavior of the flow network in different conditions.
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Demonstration of arching, mass flow and funnel flow with different bulk solids
Investigation of the outflow of bulk solids from silos with wedge-shaped discharge hoppers
Angle of the hopper wall adjustable while retaining
Constant outlet cross-section
Practical review of the design results
Two silos with different hopper wall materials
Silos can be removed for cleaning
Tamper for compacting the bulk solids
Front walls of the silo made of transparent material
Stopwatch for determining outflow times.
Investigate flow of compressible fluids
Transparent measuring objects with connectors for pressure measurement provide insight into the Internal structure
Pressure losses in subsonic flow in pipe elbows and various pipe sections
Measuring nozzle for determining the mass flow
Subsonic and transonic air flow
Variable speed on the radial fan for adjusting the mass flow
Record fan characteristic curve using a throttle valve
Digital displays for pressures, velocity and speed
Minimised turbulence by drawing in air and optimum arrangement of the measuring objects
Orifice for determining volumetric flow rate by differential pressure measurement
Pressure curve at subsonic and transonic nozzle flow.
