Heat-mass transfer efficiency within the cooling towers with jet-film contact devices

Мадышев, И. Н.; Дмитриева, О. С.; Дмитриев, А. В.

doi:10.1051/matecconf/201819401036

Cited by 19 publications

(4 citation statements)

References 11 publications

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“…These coefficients characterize the intensity of convective heat transfer and depend on the velocity of the heattransfer agent, as well as on the geometric parameters of the contact device and other factors. Therefore, the research aims to estimate the volumetric heat transfer coefficients for the developed filler unit of the cooling tower based on the previously obtained criterion relationship of the volumetric mass transfer coefficient [19]. The volumetric mass transfer coefficient in the filler unit with the inclined-corrugated contact elements is found as follows:…”

Section: Resultsmentioning

confidence: 99%

Cooling efficiency of filler unit in non-chemical cooling tower with advanced contact surface

2020

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The paper deals with a pressing problem on the effective cooling of circulating water at industrial plants using the evaporative cooling towers. A new design of the cooling tower is developed that prevents the biological fouling of the equipment surfaces without the use of chemicals. The design of the filler unit with the inclined-corrugated plates and the metal mesh provides the advanced gas-liquid contact surface. An evaluation of the cooling efficiency of the inclined corrugated contact elements is performed by means of the volumetric coefficient values of heat transfer in the gas phase. From experimental data, it has been found that with increasing the wetting density, the volumetric heat transfer coefficients also increase at the same mean-flow air velocity. A comparative analysis of Merkel numbers for the developed filler unit with the existing analogs as the characteristic of cooling capacity indicated its superiority.

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Section: Resultsmentioning

confidence: 99%

Cooling efficiency of filler unit in non-chemical cooling tower with advanced contact surface

2020

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“…As production capacities and consumer needs evolve, more and more attention is paid to improving the performance of heat exchangers, and in particular, to increasing the yield of the finished product while maintaining its performance characteristics [15][16][17]. Process lines and equipment for the thermal destruction of hydrocarbon waste were developed as a special type of industrial heat exchanger [18,19].…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Study of Heat Transfer in Pyrolysis Reactor Heat Exchange Channels with Different Hemispherical Protrusion Geometries

Kolenchukov,

Bashmur,

Kurashkin

et al. 2023

Energies

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One of the most effective technologies for recycling organic waste is its thermal destruction by pyrolysis methods to produce valuable products such as hydrogen and mixtures containing hydrogen. Increasing the thermal power of the flow helps to reduce the formation of secondary reactions, making the non-condensable hydrocarbon gas in the pyrolysis process cleaner, which simplifies further technology for the production of hydrogen and hydrogen-containing mixtures. In addition, the economic viability of pyrolysis depends on the energy costs required to decompose the organic feedstock. Using passive intensifiers in the form of discrete rough surfaces in heat exchanging channels is a widely used method of increasing heat transfer. This paper presents the results of numerical and experimental studies of heat transfer and hydraulic resistance in a channel with and without hemispherical protrusions applied to the heat transfer surface. The investigations were carried out for a reactor channel 150 mm long and 31 mm in diameter, with a constant pitch of the protrusions along the channels of 20 mm and protrusion heights h of 1 to 4 mm for 419 ≤ Re ≤ 2795. Compared to a smooth channel, a channel with protrusions increases heat transfer by an average of 2.23 times. By comparing the heat exchange parameters and the hydraulic resistance of the heat exchange channels, it was determined that h = 2 mm and 838 < Re < 1223 is the combination of parameters providing the best energetic mode of reactor operation. In general, an increase in h and coolant flow rate resulted in an uneven increase in heat transfer intensity. However, as h increases, the dead zone effect behind the protrusions increases and the rough channel working area decreases. Furthermore, increasing Re > 1223 is not advisable due to the increased cost of maintaining high coolant velocity and the reduced heat transfer capacity of the channel.

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“…The selection of well-known and the creation of new contact packing devices for technological mass transfer equipment is always associated with the need to evaluate their effectiveness for the conditions of a particular process. Work on improving mass transfer contact devices has been very active, and this has been the subject of numerous studies by many leading scientists [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. The main tasks that contact mass transfer devices are designed for are developing the inter phase surface and implementing the developed hydromechanical regimes providing mutual mixing and activation of diffusion processes between the contacting components of mass transfer processes.…”

Section: Introductionmentioning

confidence: 99%

The use of industrial wastes from machine-building enterprises as packing materials for small-sized absorbers for gas emissions purification

Меренцов

Persidskiy²,

Lebedev

et al. 2019

MATEC Web Conf.

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The paper covers the prospects to use industrial wastes from machine-building enterprises, appearing while machining various steel grades, as packing materials for industrial absorbers for environmental cleaning processes of gas emissions. The article provides obtained and processed in the criterial way experimental data in hydrodynamics of a packing material sample from metal working machines wastes appearing while treating Aisi 316Ti steel bars; packing material according to the classification method for processing experimental data λ=f(Rem) is oriented to the absorption process during selective gas cleaning in environmental equipment. The authors have compared the studied packing material to the packing that are widely used in industries. The authors have studied the main experimentally confirmed hydrodynamic effects indicating the high efficiency of the proposed packing material. The authors have made calculations for a small-sized industrial absorber for cleaning gas emissions with the use of the studied packing material.

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Heat-mass transfer efficiency within the cooling towers with jet-film contact devices

Cited by 19 publications

References 11 publications

Cooling efficiency of filler unit in non-chemical cooling tower with advanced contact surface

Cooling efficiency of filler unit in non-chemical cooling tower with advanced contact surface

Numerical and Experimental Study of Heat Transfer in Pyrolysis Reactor Heat Exchange Channels with Different Hemispherical Protrusion Geometries

The use of industrial wastes from machine-building enterprises as packing materials for small-sized absorbers for gas emissions purification

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