Experimental Study of Drying Ratio and Humidity of Silica

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Experimental Study of Drying Ratio and Humidity of

2019-12-9  This study defines the efficient parameters of material and hot air movement, humidity, necessary drying temperature to specify quality of material drying. Four samples of silica sand with different amounts of water at three different temperatures are tested experimentally. The relationships of both drying ratio and humidity with temperature were determined. The results of this study can be implemented in many fields of the industry where dryers and silica

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Study of thermal conductivity and effect of humidity

2009-4-10  The experimental results on the study of thermal conductivity and effect of humidity on HMDZ modified TEOS based aerogels dried at ambient pressure, are reported. Silica sol was prepared by keeping the MeOH/TEOS molar ratio, Acidic water (Oxalic acid) and basic water (NH 4 OH) concentrations constant at 16.5, 0.001 and 1 M, respectively throughout ...

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Study of evaporative drying of treated silica gels ...

2004-12-15  The evaporative drying of a silica gel has been previously described , , and can be separated into three phases: (1) constant rate period when the volume losses of the gel and evaporated liquid are balanced; (2) first falling rate period when liquid flows through partially empty pores; and (3) second falling rate period when liquid escapes the drying gel only via diffusive vapor transport to the

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A systematic study of the hydration and drying

2017-3-30  Since our preliminary results indicated that the degree of air humidity can have a significant influence on the line shape and signal intensity of the Cu(II) EPR spectra recorded from silica xerogels, it is reasonable to suppose that the latter might also be affected by the hydration/drying process for these materials. Accordingly, the object of the present paper is to monitor the influence of the hydration and drying

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Surface patterns in drying films of silica colloidal ...

2015-8-11  We report an experimental study on the drying of silica colloidal dispersions. Here we focus on surfaceinstability occurring in a drying paste phase before crack formation which affects thefinal film quality.Observations at macroscopic and microscopic scales reveal the occurrence of instability, and themorphology of thefilm surface. Furthermore, we show that the addition of adsorbing polymers on

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Experimental study of wet porous sand layer air

2020-2-1  The air has a humidity ratio of 0.1 kg/kg, yielding wet bulb temperatures of 22.5, 27.4 and 33.5 °C for T 0 = 45, 60 and 75 °C, which can be calculated from the equation given by Min and Tang and Tang and Min . The air velocity is measured by the anemometer locating 50 mm above the sand layer surface and is maintained at 0.3 m/s throughout the experiment.

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Determination of Moisture Diffusivity d uring Drying of ...

2014-4-3  Mortar Cement: Experimental and Modeling Study . Generally, convective drying process passes by several phases, commonly divided into 3 phases. The first phase; is a short period called adaptation period. During this phase, the product adapts its comportment to the new applied conditions. The second period is also called constant drying

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Influence of silica fume replacement of cement on ...

1998-10-1  Drying shrinkage of mortar bars without silica fume was 0.012%. The experimental results indicate that silica fume changes the drying shrinkage of mortars very significantly. It was observed that the drying shrinkage increases as the percentage of silica fume increased. This fact is evidently supported by the literature 6, 7, 8 cited in this paper. The shrinkage of mortar bars at 405 days

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Modeling of Silica Gel Dehydration Assisted by Power ...

2020-10-13  humidified by the humidizer till the experimental moisture ratio. In this study, the initial weight of the moisted silica gel before regeneration was identically 200.4f0.1 grams. Thirdly, the bed was temporarily moved away from the air duct. The humidifier was turned off, and the heater was turned on.

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Experimental study of an energy efficient hybrid

2011-3-1  The states of the drying air are determined with psychrometric relations illustrated in Fig. 2. The air conditions used in the analysis of the drying process are the DBT of 19.3 °C and RH of 54.2% at the evaporator inlet, sensible heat ration (SHR) 0.7, air flow rate of 1300 m 3 /h

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A systematic study of the hydration and drying

2017-3-30  Abstract The influence of the hydration and drying process on the line shape and signal intensity of the electron paramagnetic resonance spectra recorded from Cu(II) ions present in silica xerogels calcined at various temperatures was investigated. The experimental Cu(II) electron paramagnetic resonance spectra were found to consist of a superimposition of three individual

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Moisture Transport in Silica Gel Packed Beds: II ...

2013-10-14  .Silica Gel Packed Beds II. Experimental Study Ahmad A. Pesaran (SERI) Anthony F. Mills (University of California) August 1986 To Appear in International Journal of Heat and Mass Transfer Prepared under Task No. 3022.210 FTP No. 01-540 Solar Energy Research Institute A Division of Midwest Research Institute 1617 Cole Boulevard Golden, Colorado ...

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Experimental study of hay-drying with a liquid

1995-12-31  OSTI.GOV Conference: Experimental study of hay-drying with a liquid-desiccant system Title: Experimental study of hay-drying with a liquid-desiccant system Full Record

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Modeling of Silica Gel Dehydration Assisted by Power ...

2020-10-13  humidified by the humidizer till the experimental moisture ratio. In this study, the initial weight of the moisted silica gel before regeneration was identically 200.4f0.1 grams. Thirdly, the bed was temporarily moved away from the air duct. The humidifier was turned off, and the heater was turned on.

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Surface patterns in drying films of silica colloidal ...

2015-8-11  Surface patterns in drying films of silica colloidal dispersions F. Boulogne,†* F. Giorgiutti-Dauphin´e and L. Pauchard We report an experimental study on the drying of silica colloidal dispersions. Here we focus on surface instability occurring in a drying paste phase before crack formation which affects the final film quality.

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Moisture Transport in Silica Gel Packed Beds: I ...

2013-10-14  The most pertinent study of moisture transport 1n silica gel particles is that of Kruckels [4], who performed both an experimental and theoretical study of ~water vapor adsorption by single isothermal silica gel particles: the experiments- were performed with pure vapor to eliminate any gas-side.. resistance.

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Experimental analysis of low-temperature grain drying ...

2021-2-9  The experimental study reveals the average heat content of air entering the dryer is 1.46, ... the humidity in the drying chamber is controlled by employing sorbents. ... Process time variation of exit air humidity ratio and temperature with respect to inlet air humidity ratio and temperature for desiccant beds and grain dryer are depicted in ...

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Determination of Moisture Diffusivity d uring Drying of ...

2014-4-3  : Determination of Moisture Diffusivity during Drying of Mortar Cement: Experimental and Modeling Study . Generally, convective drying process passes by several phases, commonly divided into 3 phases. The first phase; is a short period called adaptation period. During this phase, the product adapts its comportment to the new applied conditions.

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Experimental Analysis of a Solar Dryer Equipped with a ...

The fresh air with low humidity ratio is then mixed with the circulating air coming from the internal closed-loop system. This makes humidity ratio of drying air to drop below the set point. Humidity of the mixture is given by Equation (5) (Brooker et al., 1992): (5) Experimental Setup A

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Moisture Transport in Silica Gel Packed Beds: I ...

2013-10-14  The most pertinent study of moisture transport 1n silica gel particles is that of Kruckels [4], who performed both an experimental and theoretical study of ~water vapor adsorption by single isothermal silica gel particles: the experiments- were performed with pure vapor to eliminate any gas-side.. resistance.

Get price

Experimental Analysis of a Solar Dryer Equipped with a ...

The fresh air with low humidity ratio is then mixed with the circulating air coming from the internal closed-loop system. This makes humidity ratio of drying air to drop below the set point. Humidity of the mixture is given by Equation (5) (Brooker et al., 1992): (5) Experimental Setup A

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Chapter 6 DRYING - Universiti Teknologi Malaysia

2016-6-27  Use the humidity chart to estimate humidity Calculate the equilibrium moisture content of the ... Drying: Experimental Procedures Solid placed on a tray ... from a balance Record loss in weight during drying Condition closely resemble actual large scale operations Ratio of drying to non-drying surface, bed depth, air velocity, humidity, ...

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Determination of Moisture Diffusivity during Drying of ...

2013-3-1  The aim of this study is the experimental characterization of the behaviour of a mortar during convective drying. We focalise on mortar that has a rate water-cement of 0.5. The drying tests are developed in a micro-convective dryer that can use samples weighing from 0 to 8g. The advantage of these experiments is to reproduce the natural conditions that can be found during the treatment of the ...

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Numerical modeling and experimental evaluation of

2016-6-21  Numerical modeling and experimental evaluation of drying shrinkage of concretes incorporating fly ash and silica fume. In order to handle complex nonlinear relationships between various inputs and outputs, soft computing techniques are used. The aim of the study is to derive mathematical models obtained from neural network and genetic programming.

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Impact of Humidity on Silica Nanoparticle

2018-6-26  The effect of humidity on flame-made metal oxide agglomerate morphology and size distribution is investigated, for the first time to our knowledge, and compared to that on soot, which has been widely studied. Understanding the impact of humidity on such characteristics is essential for storage, handling, processing, and eventual performance of nanomaterials. More specifically, broadly

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The Effect of TEOS/MTES Ratio on the Structural and ...

2003-4-3  Although some highly sophisticated in situ techniques such as Rutherford backscattering (RBS) exist, nitrogen adsorption is often used on bulk silica materials that have gone through similar drying process as the films. 12 13 Figure 1 shows the nitrogen adsorption-desorption isotherms of bulk silica samples with different TEOS/MTES molar ratio.

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Geosciences Free Full-Text Experimental Study on

The results of the study on the potential use of polypropylene fiber and silica fume to improve the behavior of expansive soil and reduce upward swelling pressure show that the inclusion of silica fume and polypropylene fiber reduces the plastic index (PI) and

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