The use of non-metal materials in the filler units of cooling towers with circulating water supply system

The design of cooling tower`s filler unit, consisting of inclined-corrugated contact elements, and made of polymer material, is developed and described in this research paper. The experimental studies were conducted to determine the efficiency of cooling the circulating water in the proposed cooling tower. The authors obtained the results of evaluating the heat-mass transfer efficiency coefficient of cooling tower, when changing the mass flow rates of liquid and gas phases. The research results showed that the highest efficiency of cooling the circulating water is observed at relatively low irrigation densities equal to 15-25 m3/(m2·h), while the heat-mass transfer efficiency of cooling tower achieves 72%.The use of non-metal materials as the main elements of cooling tower allows to abandon the use of chemical reagents against bacteria and microorganisms in favor of circulating water ozonation method.

Download Full-text

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

MATEC Web of Conferences ◽

10.1051/matecconf/201819401036 ◽

2018 ◽

Vol 194 ◽

pp. 01036 ◽

Cited By ~ 12

Author(s):

Ilnur N. Madyshev ◽

Oksana S. Dmitrieva ◽

Andrey V. Dmitriev

Keyword(s):

Mass Transfer ◽

Heat Mass Transfer ◽

Transfer Efficiency ◽

Efficiency Coefficient ◽

Design Elements ◽

Gas Phases ◽

Mass Transfer Efficiency ◽

Mass Transfer Processes ◽

Experimental Apparatus ◽

Contact Devices

Jet-film contact devices with special design elements for intensification of heat-mass transfer processes are proposed. An experimental apparatus has been created in order to study the interaction of water and air flows within these devices. It has been revealed that an increase in the ratio of mass flow rate of liquid and gas phases leads to a decrease in heat efficiency coefficient. Within the area of high values of specific loads, an increase in the local minimum of mass transfer efficiency is observed.

Download Full-text

Mass-Transfer Efficiency of Membrane Extraction in Laminar Flow between Parallel-Plate Channels: Theoretical and Experimental Studies

Industrial & Engineering Chemistry Research ◽

10.1021/ie0611610 ◽

2007 ◽

Vol 46 (23) ◽

pp. 7788-7801 ◽

Cited By ~ 2

Author(s):

Jia J. Guo ◽

Chii D. Ho ◽

Ho M. Yeh

Keyword(s):

Mass Transfer ◽

Laminar Flow ◽

Parallel Plate ◽

Experimental Studies ◽

Membrane Extraction ◽

Transfer Efficiency ◽

Mass Transfer Efficiency

Download Full-text

Mass Transfer to Fluids Flowing Through Rotating Nonaligned Straight Tubes

Journal of Biomechanical Engineering ◽

10.1115/1.3138626 ◽

1986 ◽

Vol 108 (4) ◽

pp. 342-349 ◽

Cited By ~ 2

Author(s):

J. Berman ◽

L. F. Mockros

Keyword(s):

Mass Transfer ◽

Heat Mass Transfer ◽

Transverse Velocity ◽

Fluid Mixing ◽

Transfer Efficiency ◽

Similarity Parameter ◽

Mass Transfer Efficiency ◽

Tube Lumen ◽

Theoretical Predictions ◽

Secondary Circulations

Relatively inefficient heat/mass transfer is characteristic of tubular devices if the Reynolds number is low. One method of improving the heat/mass transfer efficiency of such devices is by inducing transverse laminar secondary circulations that are superimposed on the primary flow field; the resulting transverse velocity components lead to fluid mixing and hence augmented mass transfer in the tube lumen. The present work is a theoretical and experimental investigation of the enhanced transport in rotating, nonaligned, straight tubes, a method of transport enhancement that utilizes Coriolis acceleration to create transverse fluid mixing. This technique couples the transport advantages of coiled tubes with the design advantages of straight tubes. The overall mass balance equation is numerically solved for transfer into fluids flowing steadily through rotating nonaligned straight tubes. This solution, for small Coriolis disturbances, incorporates a third order perturbation solution for the primary and secondary flow fields. For sufficiently small Coriolis disturbances the bulk concentration increase is found to be uniquely determined by the value of a single similarity parameter. As the Coriolis disturbance is increased, however, two additional parameters are required to accurately characterize the mass transfer. In general, increasing the Coriolis accelerations results in an increase in mass transfer. There are solution regimes, however, in which increasing this acceleration can lead to a decrease in mass transfer efficiency. This interesting phenomena, which has important design implications, appears to result from velocity-weighting effects on the exiting sample. Experiments, involving the measurement of oxygen transferred into water and blood, produced data that agree with the theoretical predictions.

Download Full-text