Treatment of different types of cotton fabrics by ammonium palmitate in a supercritical CO 2 environment

Bilalov, T. R.; Zakharov, A. A.; Jaddoa, Ameer Abed; Гумеров, Ф. М.; Neindre, B. Le

doi:10.1016/j.supflu.2017.07.036

Cited by 15 publications

(5 citation statements)

References 18 publications

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“…Figure 10 depicts typical CO2-specific heat fluctuations in terms of heat based on different pressures (7.5, 8.0,10,11, and 12 MPa). At the close of the pseudocritical heat zone, which matches the maxim of specified temperature at the working pressure, a drastic change may easily be seen [1][2]. CO2 temperature movement and inflow properties may vary significantly compared to steady characteristic liquids as a result of these changes in fluid property.…”

Section: Resultsmentioning

confidence: 99%

“…Among these applications are magnets high voltage systems, pressurized nuclear fission systems, spacecraft applications such as thermal administration systems, and electronic device industrialization [1]. In the literature, experiments were conducted for the following cases: aligned channels, perpendicular channels, perpendicular packed bed channels, perpendicular annulus, tube-in-tube, and perpendicular normal circulation tube forms, micro-porous media along with one more structure by researchers [2]- [5]. On the other hand, temperature movement was greatly improved in the adjacent region of the critical area, with the greatest temperature movement parameters happening at the analogous pseudo-critical temperature.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of Supercritical Fluid Heat Transfer Properties in a Miniature Heat Sink

Jaddoa¹

2022

JMechE

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Currently, efficient heat transmission for compact electronic elements is an essential matter. The objective of this project is to build a test rig to study the heat transfer effect of SCF-CO2 on the miniature heat sink, which is used in cooling in much small electronic equipment. It needs a heat sink with a liquid cooling scheme that meets these demands as much as feasible. The dimensions of 20 mm x 20 mm and a width of 3 mm were adopted for features of heat transfer as well as the fluid flow of supercritical CO2 in heat sink copper 360 alloys in this study. A heat sink has 20 homogeneous arrays of fins and 19 tubes, each having a rectangular cross-section and a 1mm hydraulic diameter. Moreover, the adopted pressures, temperatures, and mass velocity ranges were 7.5 to 12 MPa, 35 to 50 oC, and 100 to 500 Kg m-2 s-1, respectively, wherein the CO2 cooled under these conditions. The results of the experiment found that there is a substantial impact on the properties of liquid inflow and temperature motion by the system pressure, the temperature of CO2 as well as cluster velocity. Additionally, as the medium temperature of CO2 in the adjacent significant point area increased, the pressure decreased and the medium temperature movement factor augmented dramatically. It was also noted that the medium temperature movement factor peaked at the pseudo-critical temperature. Using the obtained data, a novel correlation mechanism for limited convection of super-critical CO2 in regular multi-port micro tubes based on chilling conditions was constructed using the obtained coefficients in this study.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Supercritical Fluid Heat Transfer Properties in a Miniature Heat Sink

Jaddoa¹

2022

JMechE

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“…In many applications, however, the design limitation is the solubility of the substance in supercritical carbon dioxide. Therefore, the solubility data are essential both for the initial feasibility study and final process design [1][2][3][4][5][6]. The study focused on the following polar additives: Acetone, Ethanol, Methanol, Chloroform, and Dimethyl sulfoxide (DMSO).…”

Section: Convection Heat Transfer In a Porous Tube With Pure Comentioning

confidence: 99%

“…Also, these benefits lead to porous structure penetration as well as to heterogeneous catalytic regeneration and to avoid synthesis problems [1][2][3][4]. Moreover, supercritical fluids are considered as a way to increase the roughness of surfaces and analyze the free surface energy of the tissue when being not wet, and contact at high water higher than 15O [5]. Different fins in mini-tube by mixing convection heat transfer to supercritical carbon dioxide media experimentally was studied reference [6] indicated the influence of mass flow rate, the temperature of inlet and heat flux for miniature tube in addition to the factor of friction, improve efficiency, the correlation for Nusselt number and criteria of performance evaluation.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Convection Heat Transfers for Vertical Mini-Tubes Using Solvent Carbon Dioxide and Porous Media at Supercritical Pressure

J.Kkihlefa¹,

Jaddoa²,

Reja³

2021

ETJ

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Heat transfer coefficient was bigger about 4 times when using the porous media tube compared with the empty type in the case of using a 5% of acetone solvent.  High mass flow rate because of the sound effect of the thermophysical properties on the convection heat transfer.  Cellulose is containing from paper fibers and produced from recycling about 75 % to 85%.Porous media and solvent CO 2 at supercritical pressure were investigated experimentally to study the effect of convection heat transfer in vertical minitubes. Mini-tubes diameter (5 and 8 mm) with medium porosity of 0.5 are proposed in experimental investigation. Experimental conditions consisted of bulk fluid, wall temperatures ranged from 33 to 55 oC, and 8 to 10 MPa of pressure. Reynolds number, Mass flow rate, and heat flux were 1750 to 21000, 0.5 to 4.5 Kg/h, and 3.25×104 to 1.1×105 W/m2 respectively. Some chemical additives like Ethanol, Chloroform, Acetone, Dimethyl sulfoxide, and Methanol were considered. A special focus was dedicated to studying the influence of heat flux, inlet temperature, and mass flow rate at measured values of wall and fluid bulk temperatures, and coefficients of local heat transfer for mini-tubes and porous media. A higher effect was noticed on the convection heat transfer by buoyancy and properties of the thermophysical variable of solvent CO2 in minitube at vertical position. However, when these results were compared with the controls (empty tube) shoewn dramatically different results. Heat transfer coefficient was bigger about 4 times when using the porous media tube compared with the empty type in the case of using a 5% of acetone solvent.

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“…On various kinds of cotton fabrics, SC-CO2 has utilized in impregnation process by ammonium palmitate. The aim of work is to prove the effect of water-repellent, in addition to present ability of the modified and pure SC-CO2 to dissolve the ammonium palmitate [4,5]. Jaddoa [6], studied experimentally the convection heat transfer for mini-tubes with fins in the presence of SC-CO2 media.…”

Section: Introductionmentioning

confidence: 99%

Convection Heat Transfer Analysis with Flow Resistance for Mini-Helically Coiled Tubes at Supercritical Pressures Experimentally

Jaddoa¹

2021

IJHT

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This paper analyzes the effect of fluid flow characteristics on the convection heat transfer for mini-helically coiled tubes (HCT) using supercritical carbon dioxide (CO2) as a natural refrigerant. Two experimental cases have studied in this work for mini-helically coiled tubes at different diameters with different coil pitches for analyzing the convection heat transfer with flow resistance. In the first case, the inner tube diameter, coil diameter and coil pitch were 5 mm, 200 mm and 10 mm respectively, while 10 mm, 100 mm and 5 mm were for the second case. Moreover, this work has also investigated the influence of frictional pressure drop, heat flux, friction factor and mass flux on dimensionless exergy destruction. The work environments were 300-500 K as an inlet temperatures range, 200-2000 Kg / (m2. s) as a mass heat fluxes range, 50,000-500,000 as a Reynolds number (Re) range and 50-200 Kw/m2 as an inner heat fluxes range. As a result, a large effect has been observed for dimensionless exergy destruction compared with the flow friction of CO2 which induced by heat transfer irreversibility. On the other point of view, a good sensitivity of optimal Re with the tube dimeter and mass flux also noticed compared with the heat flux. At a suitable range for Re, smallest and best exergy destruction also noticed for the tube diameters. A correlation has for the optimal Reynolds number as function of main dimensionless parameters related to wall heat flux, mass flux, fluid properties and geometric dimensions is proposed. Characteristics of the fluid flow had influenced significantly by mass and heat fluxes. In the future, the collected experimental data can be employed in order to design and improve the refrigeration conditioning performance for exchangers and other systems such as heat pumps.

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Treatment of different types of cotton fabrics by ammonium palmitate in a supercritical CO 2 environment

Cited by 15 publications

References 18 publications

Experimental Investigation of Supercritical Fluid Heat Transfer Properties in a Miniature Heat Sink

Experimental Investigation of Supercritical Fluid Heat Transfer Properties in a Miniature Heat Sink

The Influence of Convection Heat Transfers for Vertical Mini-Tubes Using Solvent Carbon Dioxide and Porous Media at Supercritical Pressure

Convection Heat Transfer Analysis with Flow Resistance for Mini-Helically Coiled Tubes at Supercritical Pressures Experimentally

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