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Experimental studies of hydrodynamic characteristics of heat and mass transfer devices in air-water systems

EPC “Inzhekhim” (EPC “Ingehim”, as in official documents) owns an experimental research laboratory for hydrodynamic testing at the air-water system. The laboratory is used extensively for testing the developed heat and mass transfer devices.

Test rig for hydrodynamic testing of heat and mass transfer devices
Test rig for hydrodynamic testing of heat and mass transfer devices

 

All works are carried out by technicians having extensive hands-on experience, who are guided by engineers holding Ph.D. or D.Sc. degrees. We offer our high-quality service in testing various heat and mass transfer devices to external organizations as well.

The Customer receives a technical report upon completion of the works.

In case you are interested, please, send us a complete description of the experiments via e-mail, so that our specialists can estimate the cost and time schedule of works.

 

Schematic and principle of operation of the test rig

Schematic of a test rig for measuring hydrodynamic characteristics
Schematic of the test rig for hydrodynamic testing of heat and mass transfer devices

 

The experimental test stand represents a shell-type column allowing for installing shells of diameter up to 1200 mm in the testing section of the column (pos. 1). Shells of diameter 300-1200 mm can be used for measuring pressure drop through the packed layer of depth 0.5-2 m.

Air inlet section (pos. 2) with a 1-m diameter shell is equipped with a device to create a uniform distribution of gas stream accross a cross-sectional area of the apparatus.

The column’s bottom (pos. 3), having diameter 1.5 m and volume 1.8 m3, contains a hydraulic lock of depth 600 mm.

Air is pumped into the column (pos. 1) by a turbine compressor (pos. 5) through a 300-mm diameter pipe (pos. 4). Maximum capacity of the air blower is 8000 m3/h at gage pressure 20 kPa. A flow meter (FT1) is installed into the discharge line. The flow meter has a remote panel for displaying current values of parameters and holding outlet RS485 for connecting to the controller-based control system.

To measure temperature in the measuring zone, the column is equipped with temperature sensors TT1…4 connected to secondary instruments at exit RS485.

Control over pressure loss  in the layer of contact devices is accomplished through differential pressure sensors PDI1…6.

To prevent formation of water blockages inside pulse tubes, a device to remove water from pulse tubes is installed. The device represents a hydraulic lock. Signals from the lock’s air-filled space are outputted to the control panel. Sampling “noise” picked at pressure drop measurements is eliminated by a U-shaped vessel having an extension section and connected to outlets P+ , P- of the pressure drop meters.

Irrigation of the column’s top with water is accomplished by a pump (pos. 6) of capacity up to 40 m3/h. The pump is fed with water from the column’s bottom (pos. 2). Water enters the pump suction branch through valves B1 and B2 (pos. 6).

A device for registering water flowrate (FT2) with outlet RS485, temperature sensor TT6 and pressure sensor PT2 are installed at the discharge pipe.

At low flowrates of water (up to 450 l/h), rotameters FT3, 4 are used . The operator sets flowrates manually using control valves B1, B2 and records them into a log.

Frequency converter ПЧ2 with outlet RS232 is used for adjusting the pump. A bypass line is installed at the pump’s manifold to simplify control over the pump at low values of the flow rate.

The system feeds water at quantities required to create irrigation rate 140 m3/m2·h.

The test stand allows using one of several available liquid distributors to create a required liquid distribution. Replacement of a distributor can be arranged without equipment shutdown. The distributors form a uniform irrigation due to a high concentration of irrigation points for liquid flow out (100 points/m2).

A centrifugal vortex-type tray is installed at the top of the apparatus to suppress droplet re-entrainment. The separated liquid passes through a special hydraulic lock and metering devices and returns to the column’s bottom.