Evaporation Time of Gasoline and Diesel Fuel Droplets on a Hot Plate: The Influence of Fuel Deposits

2008 ◽  
Author(s):  
P. Seers ◽  
V. Reguillet ◽  
E. Plamondon ◽  
L. Dufresne ◽  
S. Halle´
Keyword(s):  
Diesel Fuel ◽  
Droplet Evaporation ◽  
Evaporation Time ◽  
Plate Temperature ◽  
Diesel Fuels ◽  
Fuel Droplets ◽  
Initial Fuel ◽  
Property Changes ◽  
Fuel Evaporation ◽  
Hot Surface

The objective of this paper is to present experimental results of multicomponent fuel droplets impinging on a hot surface in order to quantify the influence of fuel build-up deposits on the evaporation time. The experiments were conducted with gasoline and diesel fuels to first obtain curves of evaporation time as a function of plate temperature. Based on these curves the Nukiyama and Leindenfrost temperatures were identified. In a second step, the effect of fuel deposit on the droplet evaporation time was studied. Based on the above evaporation time curves, plate temperatures were chosen as to offer a similar evaporation time but at temperatures below and above the Nukiyama and Leindenfrost temperatures respectively. This was done in order to isolate the effect of fuel deposits from the different evaporation mechanisms. The evaporation of successive impinging droplets was then measured. The results hence obtained indeed showed that the fuel deposit has a different impact on the evaporation time according the evaporating mechanism or equivalently the plate temperature. For plate temperatures lower than the Nukiyama temperature, gasoline and diesel fuel droplets showed an increase of their evaporation time as the amount of successive impinging droplets increased. The trend was reversed for plate temperatures above the Leindenfrost temperature. A hypothesis for this latter case is that the fuel deposit disrupts the vapor layer supporting the droplet and therefore provides a greater heat flux to the evaporating droplet. Finally, droplet evaporation times as a function of plate temperature were measured with an initial fuel deposit covering the plate. These results in turn showed that the global thermal diffusivity and porosity of the surface are changed by the presence of the fuel deposit. The consequence of these property changes are then shown to have a direct and global impact on the fuel evaporation time curves.

An Experimental Study on Diesel Fuel Droplets Coupling Evaporation

2011 ◽  
Vol 383-390 ◽  
pp. 3068-3076
Author(s):  
Yu Po Ma ◽  
Xiang Rong Li ◽  
Xiang Yuan Wang ◽  
Fu Shui Liu
Keyword(s):  
Continuous Improvement ◽  
Diesel Fuel ◽  
Evaporation Rate ◽  
Mutual Influence ◽  
Experimental System ◽  
Droplet Evaporation ◽  
Single Droplet ◽  
Fuel Droplets ◽  
Background Temperature ◽  
Fuel Evaporation

With the continuous improvement of power density,in the process of diesel fuel evaporation in cylinder, the interaction between droplets continues to grow. In order to study the mutual influence in the process of droplets evaporation, the evaporation phenomenas of single droplet, double-droplet and multi-droplet were studied experimentally in this paper. Firstly the influence of background temperature on single droplet evaporation rate was contrasted to verify the reasonableness of the experimental system. And then the influence of number of droplets and distance between droplets was compared and elicited the value of evaporation rate for each experimental condition. It can be found that when the number of droplets increases, the evaporation rate of droplets decreases; when the distance between droplets decreases, the evaporation rate of droplets also reduced.

Effect of Additives on the Cetane Ratings of Diesel Fuels as Related to the Ignition Delays of Liquid Fuel Droplets Impinging on a Hot Surface

1972 ◽  
Vol 186 (1) ◽  
pp. 317-321 ◽  
Author(s):  
S. Satcunanathan ◽  
M. S. El Nesr
Keyword(s):  
Ignition Delay ◽  
Liquid Fuel ◽  
Diesel Fuels ◽  
Fuel Droplets ◽  
Effect Of Additives ◽  
Hot Surface

Results of an investigation show that the effects of additives on the ignition delays of liquid fuel droplets impinging on a hot surface correlate satisfactorily with their effects on the cetane ratings of diesel fuels. It is also shown that additives for diesel fuels may be divided into three categories according to their effects on the above mentioned ignition delays, viz. (1) those that reduce the ignition delay at all dosages, (2) those that reduce the ignition delay at small dosages but increase it at high dosage and (3) those that do not have any significant effect on the ignition delay.

Numerical Investigation of Combustion Performance Utilizing Envo-Diesel Blends

2013 ◽  
Vol 647 ◽  
pp. 822-827
Author(s):  
Mohamad Shaiful Ashrul Ishak ◽  
Mohd. Amirul Amin Arizal ◽  
Mohammad Nazri Mohd. Jaafar ◽  
A.R. Norwazan ◽  
Ismail Azmi
Keyword(s):  
Power Generation ◽  
Diesel Fuel ◽  
Gas Turbines ◽  
Energy Demand ◽  
Mass Fraction ◽  
Fossil Fuels ◽  
Combustion Performance ◽  
Diesel Fuels ◽  
Fuel Droplets ◽  
Spray Flames

Alternative fuel and renewable energy is needed to fulfill the energy demand of the world. The use of envo-diesel fuels for power generation seems a viable solution for the problems of decreasing fossil-fuel reserves and environmental concerns. The use of envo-diesel in gas turbines would extend this application to power generation field. Envo-diesel is considered as better option because of its environmental friendly characteristics while giving almost the same functional properties like a fossil fuels. The gas turbine combustion performance that utilizes palm envo-diesel fuel is investigated. This study is to perform a detailed simulation of combustion and thermal flow behaviors inside the combustor. The simulations are conducted using the commercial Computational Fluid Dynamics (CFD) package software to determine the spray flames and combustion characteristics of commercial diesel fuel, envo-E5 and envo-E10. The diameter and temperature of the fuel droplets; and temperature contour, mass fraction of diesel and mass fraction of carbon dioxide (CO2) of the combustor were obtained for commercial diesel fuel, envo-E5 and envo-E10. Diesel fuel displayed higher rates of droplet evaporation compared to E5 and E10 with SMD differential about 30 to 40 μm while mass fraction for E5 and E10 slightly lower than conventional diesel.

The Leidenfrost Phenomenon on Silicon Nanowires

2016 ◽  
Author(s):  
Manuel Auliano ◽  
Maria Fernandino ◽  
Peng Zhang ◽  
Carlos Alberto Dorao
Keyword(s):  
Heat Transfer ◽  
Silicon Nanowires ◽  
Droplet Evaporation ◽  
Vapor Layer ◽  
Si Nanowires ◽  
Evaporation Time ◽  
Nanostructured Surfaces ◽  
Leidenfrost Temperature ◽  
Efficient Heat Transfer ◽  
Hot Surface

In this paper, the effect of Si nanowires on the Leidenfrost point on impacting water droplet is presented. In the Leidenfrost regime, the low thermal conductivity of the vapor layer hinders the heat transfer from the hot surface. Nanostructured surfaces can dramatically increase the Leidenfrost temperature improving heat transfer at high temperature. To determine the point of the minimum efficient heat transfer, the droplet lifetime method was employed for both the polished and processed surfaces. The cooling performance was discussed in terms of the droplet evaporation time. The surface with the tallest NWs structure yielded the highest shift in the Leideinfrost point, about 156 % higher than a plain Si surface.

scholarly journals Investigation on the Characteristics of Biodiesel Droplets in the Engine Cylinder

Energies ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3637
Author(s):  
Ali Raza ◽  
Hassan Mehboob ◽  
Sajjad Miran ◽  
Waseem Arif ◽  
Syed Farukh Javaid Rizvi
Keyword(s):  
High Temperature ◽  
Diesel Fuel ◽  
Fossil Fuels ◽  
Renewable Energy Sources ◽  
Attractive Alternative ◽  
Discrete Phase Model ◽  
Evaporation Time ◽  
Complete Combustion ◽  
Fuel Droplets ◽  
Engine Cylinder

The world is moving towards renewable energy sources rapidly and, at present, fossil fuels are reducing day by day. In this scenario, biofuels have become an attractive alternative to conventional diesel fuels. In the present work, the vaporization of Thumba biodiesel is numerically modeled using the finite volume-based approach in ANSYS Fluent and the results are compared with diesel fuel. Evaporation of fuels is governed by the conservation equations of energy, momentum, and mass. Owing to high temperature and pressure conditions, turbulence is present in the engine cylinder. To account for the turbulence effects, the Reynolds-averaged Navier–Stokes (RANS) turbulence model is used. Heat transfer to droplet and mass lost by the droplets is governed by the discrete phase model equations. The obtained results include the droplet lifetime, increase in temperature of a droplet, and velocity profiles. It is observed that the size and temperature of fuel droplets and ambient temperature have a significant effect on the evaporation time of fuel droplets in the engine cylinder. By reducing the droplet size, the complete evaporation of fuels can be achieved. Droplets having a high temperature have a short evaporation time and high evaporation rate. It is noted that, at a higher temperature, biodiesel evaporates more quickly than diesel fuel, thus producing complete combustion and hence giving maximum power output.

Paper 41: The Spontaneous Ignition and Ignition Delay of Liquid Fuel Droplets Impinging on a Hot Surface

1967 ◽  
Vol 182 (8) ◽  
pp. 382-392 ◽  
Author(s):  
S. Satcunanathan ◽  
B. J. Zaczek
Keyword(s):  
Diesel Fuel ◽  
Ignition Delay ◽  
Liquid Fuel ◽  
Spontaneous Ignition ◽  
Temperature Range ◽  
Fuel Droplets ◽  
Minimum Value ◽  
Commercially Important ◽  
Hot Surface

The spontaneous ignition and ignition delays of liquid fuel droplets impinging on a hot surface are investigated. It is shown that the ignition delay–temperature curves follow closely the pattern of lifetime–temperature curves and that for the commercially important fuels, such as kerosine and diesel fuel, the ignition delays have a minimum value at some particular temperature. Zones of non-ignition are isolated and a hypothesis presented for their occurrence. It is further shown that within the temperature range investigated, the ignition delays of droplets impinging on a hot surface are much shorter than those of similar droplets undergoing spontaneous ignition when suspended in a stagnant atmosphere.

WATER DROPLET EVAPORATION IN A CHAMBER ISOLATED FROM THE EXTERNAL ENVIRONMENT

2020 ◽  
Vol 6 (3) ◽  
pp. 8-22
Author(s):  
KSENIA A. Batishcheva ◽  
ATLANT E. Nurpeiis
Keyword(s):  
Water Vapor ◽  
Evaporation Rate ◽  
External Environment ◽  
Heat Removal ◽  
Droplet Evaporation ◽  
Droplet Volume ◽  
Evaporation Time ◽  
Aluminum Alloy Amg6 ◽  
Evaporation Of Droplets ◽  
Contact Diameter

With an increase in the productivity of power equipment and the miniaturization of its components, the use of traditional thermal management systems becomes insufficient. There is a need to develop drip heat removal systems, based on phase transition effects. Cooling with small volumes of liquids is a promising technology for microfluidic devices or evaporation chambers, which are self-regulating systems isolated from the external environment. However, the heat removal during evaporation of droplets into a limited volume is a difficult task due to the temperature difference in the cooling device and the concentration of water vapor that is unsteady in time depending on the mass of the evaporated liquid. This paper presents the results of an experimental study of the distilled water microdrops’ (5-25 μl) evaporation on an aluminum alloy AMg6 with the temperatures of 298-353 K in an isolated chamber (70 × 70 × 30 mm3) in the presence of heat supply to its lower part. Based on the analysis of shadow images, the changes in the geometric dimensions of evaporating drops were established. They included the increase in the contact diameter, engagement of the contact line due to nano roughening and chemical composition inhomogeneous on the surface (90-95% of the total evaporation time) of the alloy and a decrease in the contact diameter. The surface temperature and droplet volume did not affect the sequence of changes in the geometric dimensions of the droplets. It was found that the droplet volume has a significant effect on the evaporation time at relatively low substrate temperatures. The results of the analysis of droplet evaporation rates and hygrometer readings have shown that reservoirs with salt solutions can be used in isolated chambers to control the concentration of water vapor. The water droplets evaporation time was determined. The analysis of the time dependences of the evaporation rate has revealed that upon the evaporation of droplets in an isolated chamber under the conditions of the present experiment, the air was not saturated with water vapor. The latter did not affect the evaporation rate.

Read More About The Modernization of the oil refinery of Heydar Aliyev

2021 ◽  
Vol 66 (05) ◽  
pp. 106-108
Author(s):  
Aytac Turab qızı Hüseynova ◽  
Keyword(s):  
Key Words ◽  
Diesel Fuel ◽  
Oil Products ◽  
Oil Refinery ◽  
Fuel Oil ◽  
Oil Refining ◽  
Diesel Fuels ◽  
Foreign Countries ◽  
History Of ◽  
The Republic

The Oil Refinery of Heydar Aliyev was created in July 1953 as a new oil refining plant Baki. The combined atmospheric vacuum plant is the main plant at the oil refining factory and its starting capacity produces 6 million tons of crude oil. In 2010, 43,000 tons A-98, 1.18 tons of A-92 and 19,700 tons of gasoline A-80. At the same time, 600 400t kerosene, 214,000 diesel fuels, 214,000 tons. Liquid gas, 267 500t coke and 220 600t. With this investigation, the history of the oil refinery and the details of modernization were considered. 21 out of 24 types of Azerbaijani oil are processed at the Baku Oil Refinery named after Heydar Aliyev, of which 15 types of oil products, including gasoline, aviation kerosene, diesel fuel, fuel oil, petroleum coke, etc. are produced. The plant fully meets the needs of the republic in oil products. In addition, 45% of oil products are exported to foreign countries. Key words: Azerbaijani, oil, recycling, factory, modernization

Performance Investigation of a Four Stroke Diesel Engine, Using Water-Based Ferrofluid as an Additive

2011 ◽  
Author(s):  
F. Daneshvar ◽  
N. Jahani ◽  
M. B. Shafii
Keyword(s):  
Experimental Study ◽  
Magnetic Nanoparticles ◽  
Diesel Engine ◽  
Diesel Fuel ◽  
Engine Performance ◽  
Brake Specific Fuel Consumption ◽  
Engine Exhaust ◽  
Brake Thermal Efficiency ◽  
Diesel Fuels ◽  
Water Based

In this experimental study, a four stroke diesel engine was conducted to investigate the effect of adding water-based ferrofluid to diesel fuel on engine performance. To our knowledge, Magnetic nanoparticles had not been used before. To this end, emulsified diesel fuels of 0, 0.4, and 0.8 water-based ferrofluid/Diesel ratios by volume were used as fuel. The ferrofluid used in this study was a handmade water-based ferrofluid prepared by the authors. The results show that adding water-based ferrofluid to diesel fuel has a perceptible effect on engine performance, increasing the brake thermal efficiency relatively up to 12%, and decreasing the brake specific fuel consumption relatively up to 11% as compared to diesel fuel. In addition, the results indicate that increasing ferrofluid concentration will magnify the results. Furthermore, it was found that magnetic nanoparticles can be collected at the engine exhaust using magnetic bar.

Cold Flow Properties Of Automotive Diesel Fuels And Diesel Fuel Systems

1988 ◽  
Author(s):  
Hajime Ise ◽  
Hiroshi Hirano ◽  
Nobuyoshi Nozaki ◽  
Haruo Takizawa ◽  
Mitsuo Tamanouchi ◽  
...  
Keyword(s):  
Diesel Fuel ◽  
Flow Properties ◽  
Cold Flow ◽  
Diesel Fuels ◽  
Cold Flow Properties
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