Numerical Simulation and Thermal Factorial Analysis of Pneumatic Drying on Straw Fuel

2012 ◽  
Vol 151 ◽  
pp. 341-345 ◽  
Author(s):  
Wei Lv ◽  
Hong Wei Sun ◽  
Xin Hai Wang ◽  
Yan Dong Li ◽  
Zhi Yue Yao ◽  
...  
Keyword(s):  
Gas Flow ◽  
Horizontal Tube ◽  
Orthogonal Experimental Design ◽  
Mathematics Model ◽  
Equivalent Diameter ◽  
Drying Process ◽  
Whole Process ◽  
Hot Air ◽  
Pneumatic Drying ◽  
Mass And Heat Transfer

Based on the mechanism of mass and heat transfer of the particles and air in drying tube, the mathematics model of pneumatic drying process was established which referred to straw fuel in straight horizontal tube, and the equations were solved by Runge-Kutta integration method. Then, by analyzing the thermal factors of gas flow drying，the most important factor in gas flow drying on straw fuel was summed up which was the mass of hot air. The method of orthogonal experimental design was used to analyze the whole process of gas flow drying, and primary and secondary roles led to the conclusion, which were the mass of hot air first , the equivalent diameter of the fuel granule and the temperature of hot air.

Numerical Simulation and Test Research of Pneumatic Drying on Biomass Fuel

2013 ◽  
Vol 274 ◽  
pp. 479-482
Author(s):  
Xin Hai Wang ◽  
Wei Lv ◽  
De Li Zhang ◽  
Xiao Nan Zhang ◽  
Zhong Xia Zhao
Keyword(s):  
High Speed ◽  
Gas Flow ◽  
Horizontal Tube ◽  
Initial Water Content ◽  
Single Factor ◽  
Drying Process ◽  
Test Bed ◽  
Initial Water ◽  
Hot Air ◽  
Pneumatic Drying

Based on the mechanism of mass and heat transfer of the particles and air in drying tube，the mathematics model of pneumatic drying process was established which referred to straw fuel in straight horizontal tube. The simulating results were summed up. Test bed of pneumatic drying was established，the test results were summed up by making single-factor test on the test bed. The results of simulating and single-factor test were coincided, and the pneumatic drying process was divided into two parts which were high-speed drying area and slow drying area. The effect factors were analyzed which were initial water content, hot air temperature, mass of hot air and materiel. The most important factor in gas flow drying on straw fuel was summed up which was the mass of hot air.

scholarly journals Reconstruction of Rice Drying Model and Analysis of Tempering Characteristics Based on Drying Accumulated Temperature

2021 ◽  
Vol 11 (23) ◽  
pp. 11113
Author(s):  
Yi Jin ◽  
Jun Yin ◽  
Huihuang Xie ◽  
Zhongjie Zhang
Keyword(s):  
Moisture Ratio ◽  
Drying Process ◽  
Hot Air Drying ◽  
Exponential Relationship ◽  
Transfer Processes ◽  
Data Comparison ◽  
Hot Air ◽  
Accumulated Temperature ◽  
Mass And Heat Transfer ◽  
Rice Drying

Previous research has shown that the accumulated temperature can describe drying processes as well as crop growth. To describe the mass and heat transfer processes in the rice drying process more accurately, a mathematical model of rice drying was proposed based on the drying accumulated temperature, and the optimal tempering ratio for conventional hot air drying was obtained through data comparison and analysis. First, it was proven that there was an exponential relationship between the moisture ratio and the drying accumulated temperature of rice. Second, by comparing and analyzing the fitting results of seven different drying mathematical models, the model with the highest fitting degree was selected and reconstructed to obtain the drying accumulated temperature–moisture ratio model. Finally, the new model was used to fit the results of two drying experiments without and with tempering, and the tempering characteristics of rice drying were proved by comparing and analyzing the coefficient difference between the two models. The results showed that the optimal tempering ratio was 3. This study thus provides a reference for rice drying process parameters.

Test Research and Parameter Analysis of Grain Drying Model

2011 ◽  
Vol 66-68 ◽  
pp. 573-576
Author(s):  
Chun Shan Liu ◽  
Wen Fu Wu ◽  
Jia Yao ◽  
Ya Qin Li ◽  
Chuang Liu
Keyword(s):  
Moisture Content ◽  
Air Temperature ◽  
Air Flow ◽  
Parameter Analysis ◽  
Mathematics Model ◽  
Drying Process ◽  
Drying Time ◽  
Hot Air ◽  
Grain Moisture ◽  
Grain Drying

The purpose of this study is to explore the effecting principle in the drying process. The factors such as hot air temperature, hot air flow, drying time on the grain moisture content have been all investigated. Using UD to establish the optimization mathematics model which making the grain dryer moisture content as the goal of the design, making the factors of hot air flow, drying time, air temperature as parameters, with the help of UD to analysis the effecting principle of the drying process parameters on the grain moisture content, some references have been provided to the tower dryer.

Pressure Assisted Sintering of an Aluminium Alloy

2009 ◽  
Vol 618-619 ◽  
pp. 627-630
Author(s):  
Stephen J. Bonner ◽  
Graham B. Schaffer ◽  
Ji Yong Yao
Keyword(s):  
Aluminium Alloy ◽  
Gas Flow ◽  
Isothermal Holding ◽  
Horizontal Tube ◽  
Elevated Pressure ◽  
Nitrogen Pressure ◽  
Gas Pressure ◽  
Densification Rate ◽  
Conventional Press ◽  
Gas Pressures

An aluminium alloy was sintered using a conventional press and sinter process, at various gas pressures, to observe the effect of sintering gas pressure on the densification rate. Compacts of aluminium alloy 2712 (Al-3.8Cu-1Mg-0.7Si-0.1Sn) were prepared from elemental powders and sintered in a horizontal tube furnace under nitrogen or argon at 590°C for up to 60 minutes, and air cooled. The gas flow was adjusted to achieve specific gas pressures in the furnace. It has been found that increasing the nitrogen pressure at the start of the isothermal holding stage to 160kPa increased the densification rate compared to standard atmospheric pressure sintering. Increasing the nitrogen pressure further, up to 600kPa, had no additional benefit. The densification rate was increased significantly by increasing the gas pressure to 600kPa during both heating and isothermal holding. Under argon the elevated pressure did not increase the densification rate. Results seem to suggest that the beneficial effect of the elevated pressure on the rate of densification is related to nitride formation.

Energy and exergy analyses in drying process of porous media using hot air

2010 ◽  
Vol 37 (4) ◽  
pp. 372-378 ◽  
Author(s):  
Ratthasak Prommas ◽  
Phadungsak Rattanadecho ◽  
Dulyachot Cholaseuk
Keyword(s):  
Porous Media ◽  
Drying Process ◽  
Hot Air ◽  
Energy And Exergy ◽  
Exergy Analyses

Quality Assessment and Mathematical Modeling of Hot-Air Convective Drying of Persimmon (Diospyros kaki L.) Fruit

2017 ◽  
Vol 13 (7) ◽  
Author(s):  
Claudia Giovagnoli-Vicuña ◽  
Nelson O. Moraga ◽  
Vilbett Briones-Labarca ◽  
Pablo Pacheco-Pérez
Keyword(s):  
Quality Parameters ◽  
Time Function ◽  
Convective Drying ◽  
Diospyros Kaki ◽  
Drying Process ◽  
Temperature Function ◽  
Persimmon Fruit ◽  
Hot Air ◽  
Volume Method ◽  
Good Agreement

Abstract The influence of drying on the color, porosity, shrinkage and moisture of persimmon fruit during convective drying was determined by computer vision. The experiments were performed with persimmon fruit that were cut into slab 20 × 20 mm, which were arranged into a bigger slab, 60 × 60 mm. Drying process was carried out at 60 °C. Noticeable changes in quality parameters (color, porosity and shrinkage) could be observed during the drying process, where the central region of the sample evidenced less changes. Persimmon’s physical properties were experimentally obtained as the temperature function and heat and mass convective coefficients were adjusted as a time function. A numerical simulation using the Finite Volume Method allowed to describe the evolution of temperature and moisture content distributions during drying. The numerical and experimental results of temperature and moisture during persimmon drying were found to be in a good agreement.

scholarly journals Evaluation and Optimisation of Processes Time for the Hot Air Oven Containing Sleeves

2021 ◽  
Vol 9 (11) ◽  
pp. 404-410
Author(s):  
Bandaru Nithin Kumar Varma
Keyword(s):  
Heat Transfer ◽  
Mixed Convection ◽  
Epoxy Resin ◽  
Latent Heat ◽  
Air Flow ◽  
Whole Process ◽  
Hot Air

Abstract: The Hot air producing Oven is used to heat the sleeves which are used as raiser in casting purpose. The sleeves that are being manufactured are made of epoxy resin which consists of approximately 75% water and 25% mineral mix before heating and once the processes are complete i.e. the sleeves getting heated in the oven the product would turn into 35% water + 65% mix. The whole process would estimate the time around 4.5 hours. The first 2.5 hours the water is being removed from the sleeves in form of latent heat vaporization. The next 2 hours is use as the time for curing the them because of the flow of hot air through the sleeves. The processes time is evaluated keeping in mind that the heat transfer is happening in mixed convection. As they are placed vertically to the direction of air flow. The amount of heat transfer in terms of energy is evaluated for 4.5 hours in actual practise. The energy which is utilised in 4.5 hours is found and the same amount is consumed in 2.5 hours which is a solution solved theoretically by considering datum values. Keywords: epoxy resin, sleeves, latent heat, heat transfer, mixed convection.

Experimental Study on Hot-air Drying Process Parameters Optimization of Chinese Jujubes

2013 ◽  
Vol 12 (21) ◽  
pp. 6154-6158
Author(s):  
Xiao Kang-Yi ◽  
Chuan Feng-Li ◽  
Shu Gang-Li ◽  
He Lei Cui ◽  
Wen Fu-Wu
Keyword(s):  
Experimental Study ◽  
Process Parameters ◽  
Parameters Optimization ◽  
Drying Process ◽  
Hot Air Drying ◽  
Air Drying ◽  
Process Parameters Optimization ◽  
Hot Air
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