Influence Of Evaporation Temperature Research Articles

Study on properties of diamond-like carbon coatings based on COMSOL

Comsol software was used to design and simulate the preparation of DLC coating on 316 stainless steel substrate by vacuum evaporation plating method. The influence of evaporation temperature on coating quality was explored by controlling substrate temperature factors, and the corrosion resistance of DLC was simulated. The simulation coating preparation results showed the surface distribution of the DLC coating prepared by vacuum evaporation is uneven, and the thickest core becomes thinner layer by layer along the periphery. Under the same conditions, the higher the evaporation temperature is, the better the coating quality is. The corrosion behavior of DLC coating over time was studied by simulating the corrosion of DLC coating in the human body environment. The simulation corrosion results showed that the corrosion rate of DLC coating in the human body environment was slow, and the corrosion rate of the metal matrix was significantly higher than that of DLC coating.

Impact of the Evaporation Temperature on the Air Drying Rate for a Finned Heat Exchanger

This paper presents the thermal calculations of an air-finned heat exchanger working at temperatures above zero degrees and their verification through testing on a real device. Then, on the basis of the calculations, the influence of evaporation temperature on the drying rate of the constant speed of air flowing through the exchanger was analysed. A quantitative analysis of the effect of the temperature difference between the air being dried and the evaporator on the acceleration of the process was performed. For the analysed case, the same water mass (condensate) can be obtained for an evaporation temperature of 0 °C almost four times faster than for 10 °C. To compare temperature cases, the SMER (specific moisture evaporation ratio) was calculated, which allowed the systems to be compared in terms of energy consumption. The theoretical analysis showed that by reducing the boiling point by 10 degrees, we could increase the SMER from 0.51 kgh20/kWh to 2.18 kgh20/kWh. After receiving the experimental results and including the efficiency of the system, these values were, respectively, 0.44 ± 0.01 kgh20/kWh and 1.91 ± 0.06 kgh20/kWh.

Retraction Note: Influence of evaporation temperature on the rheological properties of modified emulsified asphaltic residues

Retraction Note: Influence of evaporation temperature on the rheological properties of modified emulsified asphaltic residues

Energy consumption evaluation of liquid food ultrasonic evaporation process

Abstract Ultrasonic evaporator is a new type of evaporation equipment using ultrasonic technology to assist evaporation and concentration. It is especially suitable for the materials which are easy to scale and foam. Due to the complexity of heat and mass transfer during ultrasonic technology to assist liquid evaporation process, there are few reports on the energy consumption of ultrasonic evaporation. In this paper, the effects of ultrasonic density, evaporation temperature, and feed flow rate on the total energy consumption of ultrasonic evaporation were studied and tap water was selected as experimental material. It was found that the optimal condition for this ultrasonic evaporator were the ultrasonic power density of 4 × 10−5 W/m2, the evaporation temperature of 65 °C, and the feed rate of 1.389 × 10−5 m3/s. According to the orthogonal test and analysis of variance, it can be obtained that the influence of evaporation temperature on total energy consumption is the largest, the second is feed flow rate, and ultrasonic power density has the least influence.

RETRACTED ARTICLE: Influence of evaporation temperature on the rheological properties of modified emulsified asphaltic residues

For two commonly used modified emulsified asphalts, styrene butadiene rubber (SBR) and styrene butadiene styrene (SBS), direct heating and low-temperature evaporation methods were respectively applied to obtain the asphaltic residues. Nanotechnology provides a great solution to road construction issues. However, the use of nanoparticles increases the durability of asphalts and enhances the performance of bitumen. Dynamic shear rheometer (DSR) was employed for temperature scanning test and multiple stress creep recovery (MSCR) test of the asphaltic residues. In this paper, the changes in the rheological properties of the asphaltic residues were compared and analyzed. The influence of evaporation temperature on the rheological properties of modified emulsified asphaltic residues obtained by evaporation was discussed. Evaporation tests showed that the higher the evaporation temperature, the larger the mass reduction of residues at the early stage and the shorter the time needed to reach stabilization. The solid contents of modified emulsified asphaltic residues obtained under different evaporation temperatures also differed. The solid content of asphaltic residues obtained under the evaporation temperature of 60 °C was closest to that by the low-temperature evaporation method. This indicated influence of the evaporation temperature on the solid content of asphaltic residues. Based on the results of temperature scanning test and MSCR test, there was a significant difference in the rheological properties of the asphaltic residues obtained by direct heating and low-temperature evaporation methods. The anti-deformation capacity under high temperature in asphaltic residues obtained at different evaporation temperatures varied more greatly. For SBS-modified emulsified asphalt, the rutting resistance under high temperature in residues obtained by the low-temperature evaporation method was better; however, the opposite was true for the SBR-modified emulsified asphalt. This indicated that the high-temperature evaporation method may overestimate the high-temperature properties of SBR-modified emulsified asphaltic residues and underestimate the high-temperature properties of SBS-modified emulsified asphaltic residues. For the emulsified asphalt samples, the appropriate method to obtain asphaltic residues that are closest to the actual road conditions should be optimized depending on the specific purposes.

The impact of filling level resolved: Capillary-assisted evaporation of water for adsorption heat pumps

Evaporation of water at low pressures is usually limited by low heat transfer coefficients. Poor heat transfer can severely restrict the performance of cooling devices such as adsorption heat pumps and chillers. The heat transfer can be enhanced by using structures such as fins and porous coatings. These structures provide capillary action to wet the heat exchanger tubes surface with a thin water film leading to high heat transfer coefficients. Hence, the evaporation performance strongly depends on the thickness of the thin water film and consequently on the filling level of the heat exchanger. In this work, the evaporation performance is investigated systematically for horizontal copper tubes with macroscopic fin structures, microporous coatings and the combination of both structures. In particular, an experimental setup is introduced to study continuously varying filling levels. The influence of evaporation temperature and heat flow on the heat transfer coefficient is studied. The heat transfer is found to depend strongly on the filling level and the temperature, whereas the heat flow has no significant influence at the studied measurement conditions. It is shown that the heat transfer is directly proportional to the tube surface wetted by capillary action. The evaporation performance of thermally-coated tubes can reach heat transfer coefficients similar to falling film evaporators. Thus, the presented tube structures allow for improved evaporator designs for future adsorption heat pumps using water as refrigerant.

Influence of Evaporation Temperature on the Morphology, Polymorph and Mechanical Properties of Poly(vinylidene fluoride) Solution-Cast Membranes

In this study, PVDF membranes were prepared by solution-cast method. The effects of evaporation temperature on the morphology, polymorph and mechanical properties of such prepared membranes were studied. It was found that perfect spherulites were observed in the solution-cast membranes. FESEM photomicrographs of the membranes showed dense structure. PVDF mainly crystallized into α phase. In the solution-cast process, the spherulite size increased as evaporation temperature was increased from 120 °C to 150 °C, when the evaporation temperature was 165 °C, spherulite size decreased. And the tensile strength increased with the decrease in spherulite size.

Thermodynamic Optimization of the Organic Rankine Cycle in a Concentrating Photovoltaic/Thermal Power Generation System

The selection criteria of working fluids for solar thermal organic Rankine cycle and the features of R245fa as a working fluid are analyzed. A thermodynamic analysis of photovoltaic / thermal organic Rankine cycle system and the influence of evaporation temperature of working fluid in the evaporator coupled with solar panels are conducted. The results show that the performance of the solar photovoltaic/thermal organic Rankine cycle can be improved by optimizing the evaporation temperature, and 130°C is an appropriate evaporation temperature.

The influence of doposition conditions on the structrure of ZnTe/ZnTe:Cu thin films and the properties of CdTe cells

Polycrystalline film of ZnTe/ZnTe:Cu is fabricated by co-vaporization. The influence of evaporation temperature on the structue of the film and Cu distribution in the film and performance of the cell fabricated with the films are studied by XRD,XPS, C-V and I-V analysis. The results indicate that, （1） the deposition temeperature has less effecton the structure of the film ZnTe/ZnTe:Cu, （2） the fact that the Cu concentration in the film deposited at 100℃ raises to a maximum and descend rapidly shows the function of ZnTe film in preventing Cu atoms diffusing in the film and the CdTe cell fabricated with the film shows a wider barrier （XD）,smaller capacitance, better diode characteristic and larger conversion efficiency.

Zur Herstellung von Reinstantimon durch Gasphasenreaktion

AbstractThe influence of evaporation temperature, reaction temperature, gas flow, and the ratio H2/SbCl3 on the gas phase reaction Economic production of ultrapure antimony is possible with this gas phase reaction.