Study of initial segment of turbulent jets of various gases in a parallel air stream

Abstract Strict requirements for microclimate parameters are imposed on food storage premises, which are equipped with artificial cooling systems. The experience of operating the refrigerated premises revealed the following disadvantages: uneven distribution and significant fluctuations in temperature and relative humidity; periodic precipitation of condensate in low-temperature sections. Elimination of the noted disadvantages is effectively achieved by using axial fans that form a swirling air stream that induces the ambient air. Swirling jets used to intensify the process of air circulation in a room in order to eliminate unventilated zones will be called activating jets. To assess the efficiency of the application of activating turbulent jets, an integral method based on the energy balance was used. Using the example of a representative object, it is shown that the distance of the effective application of an activating turbulent jet should be calculated taking into account the influence of environmental turbulence, which is determined by the amount of energy introduced and dissipated in the room.

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Turbulent Jets

10.1016/s0167-5648(08)x7035-2 ◽

1976 ◽

Keyword(s):

Turbulent Jets

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The adsorption of benzene vapour from an air stream, by beds of charcoal. II. The rate-controlling mechanism

Journal of Biochemical Toxicology ◽

10.1002/jbt.2570161203 ◽

1966 ◽

Vol 16 (12) ◽

pp. 349-355

Author(s):

W. M. Jones

Keyword(s):

Air Stream ◽

Controlling Mechanism

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Heat and Mass Transfer in a Boundary Layer in Evaporation and Combustion of Ethanol in a Turbulized Air Stream

Heat Transfer Research ◽

10.1615/heattransres.v32.i7-8.60 ◽

2001 ◽

Vol 32 (7-8) ◽

pp. 6

Author(s):

B. F. Boyarshinov

Keyword(s):

Boundary Layer ◽

Mass Transfer ◽

Heat And Mass Transfer ◽

Air Stream

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ENHANCEMENT OF HEAT TRANSFER AND REDUCTION OF DRAG OF A SQUARE PRISM ARRANGED DIAMOND-SHAPE IN AN AIR STREAM

Proceeding of International Heat Transfer Conference 11 ◽

10.1615/ihtc11.1800 ◽

1998 ◽

Cited By ~ 1

Author(s):

Tamotsu Igarashi ◽

T. Tsutsui

Keyword(s):

Heat Transfer ◽

Enhancement Of Heat Transfer ◽

Square Prism ◽

Air Stream

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LASER DIAGNOSTICS OF TRANSVERSE TURBULENT JETS

Journal of Flow Visualization and Image Processing ◽

10.1615/jflowvisimageproc.v7.i4.30 ◽

2000 ◽

Vol 7 (4) ◽

pp. 16

Author(s):

V. Sivadas ◽

B. S. Pani ◽

K. A. Butefisch

Keyword(s):

Laser Diagnostics ◽

Turbulent Jets

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Pollutant emission from a heat station supplied with agriculture biomass and wood pellet mixture

Chemical and Process Engineering ◽

10.2478/v10176-012-0020-3 ◽

2012 ◽

Vol 33 (2) ◽

pp. 231-242 ◽

Cited By ~ 4

Author(s):

Marek Juszczak ◽

Katarzyna Lossy

Keyword(s):

Carbon Monoxide ◽

Pollutant Emission ◽

Heat Output ◽

Wood Pellets ◽

Wood Pellet ◽

Carbon Monoxide Concentration ◽

Heat Efficiency ◽

Air Stream ◽

Fuel Mixtures ◽

Lower Carbon

Pollutant emission from a heat station supplied with agriculture biomass and wood pellet mixtureTests for combustion of hay and sunflower husk pellets mixed with wood pellets were performed in a horizontal-feed as well as under-feed (retort) wood pellet furnace installed in boilers with a nominal heat output of 15 and 20 kW, located in a heat station. During the combustion a slagging phenomenon was observed in the furnaces. In order to lower the temperature in the furnace, fuel feeding rate was reduced with unaltered air stream rate. The higher the proportion of wood pellets in the mixture the lower carbon monoxide concentration. The following results of carbon monoxide concentration (in mg/m3presented for 10% O2content in flue gas) for different furnaces and fuel mixtures (proportion in wt%) were obtained: horizontal-feed furnace supplied with hay/wood: 0/100 - 326; 30/70 - 157; 50/50 - 301; 100/0 - 3300; horizontal-feed furnace supplied with sunflower husk/wood: 50/50 - 1062; 67/33 - 1721; 100/0 - 3775; under-feed (retort) furnace supplied with hay/wood: 0/100 - 90; 15/85 - 157; 30/70 - 135; 50/50 - 5179; under-feed furnace supplied with sunflower husk/wood: 67/33 - 2498; 100/0 - 3128. Boiler heat output and heat efficiency was low: 7 to 13 kW and about 55%, respectively, for the boiler with horizontal-feed furnace and 9 to 14 kW and 64%, respectively, for the boiler with under-feed furnace.

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