scholarly journals Scale-Up of Agitation Fluidized Bed Granulation. II. Effects of Scale, Air Flow Velocity and Agitator Rotational Speed on Granule Size, Size Distribution, Density and Shape.

1995 ◽  
Vol 43 (7) ◽  
pp. 1217-1220 ◽  
Author(s):  
Satoru WATANO ◽  
Yoshinobu SATO ◽  
Kei MIYANAMI ◽  
Takayuki MURAKAMI ◽  
Nobumasa NAGAMI ◽  
...  
Keyword(s):  
Flow Velocity ◽  
Size Distribution ◽  
Fluidized Bed ◽  
Rotational Speed ◽  
Distribution Density ◽  
Air Flow ◽  
Scale Up ◽  
Granule Size ◽  
Air Flow Velocity

scholarly journals SCALE UP DAN UJI TEKNIS ALAT PENGERING TIPE FLUIDIZED BED [Scale Up and Technical Test of Fluidized Bed Dryer]

2017 ◽  
Vol 5 (2) ◽  
pp. 452-461
Author(s):  
Suryadi ◽  
Sukmawaty ◽  
Guyup Mahardhian Dwi Putra
Keyword(s):  
Fluidized Bed ◽  
Air Flow ◽  
Scale Up ◽  
Drying Time ◽  
Fluidized Bed Dryer ◽  
A Value ◽  
Air Flow Velocity ◽  
Time Required ◽  
The Masses ◽  
Drying Chamber

The available Fluidized Bed dryer has low drying capacity so it is necessary to increase the dimensions to improve the drying capacity. This study aimed to increased the dimensions of the Fluidized Bed dryer, to determined the drying capacity, and to conducted technical tests. This research was conducted at Power and Agriculture Machinery, Faculty of Food and Agroindustrial Technology, University of Mataram. The method used in this research was experimental method with mathematical approach. The parameters used in this study was the scale parameter and technical test parameters. Scale Up Fluidized Bed dryer was done in the drying chamber which includes the dimensions of the drying chamber and drying capacity. Technical testing included air flow velocity, the minimum fluidization velocity, temperature, drying time and space dryer efficiency. The drying chamber is a cylinder with a diameter of 40 cm, height 200 cm and 0.1256 m2 area of the base. The capacity of the Fluidized Bed dryer before Scale Up was 4 kg and the capacity after Scale Up was 8 kg. The speed of air flow through the drying chamber was 3 m/s. The distribution of temperature during the drying process ranges between 40-50℃ and 50-60℃. According to the research, the more the masses drained, the longer the time required to dry the material. The efficiency of the drying chamber mostly present in the temperature range of 50-60℃ with a value of 94.04%.  Keywords: fluidized bed, scale up, technical test ABSTRAK Alat pengering Fluidized Bed yang tersedia memiliki kapasitas pengeringan yang rendah sehingga diperlukan peningkatan ukuran dimensi alat untuk meningkatkan kapasitas pengeringan. Penelitian ini bertujuan untuk meningkatkan ukuran dimensi alat pengering Fluidized Bed, menentukan kapasitas pengeringan dan melakukan uji teknis. Penelitian ini dilakukan di Laboratorium Daya dan Mesin Pertanian Fakultas Teknologi Pangan dan Agroindustri Universitas Mataram. Metode yang digunakan pada penelitian ini adalah metode eksperimental dengan pendekatan matematis. Parameter yang digunakan pada penelitian ini adalah parameter Scale Up dan parameter uji teknis. Scale Up alat pengering Fluidized Bed dilakukan pada bagian ruang pengering yang meliputi dimensi ruang pengering dan kapasitas pengeringan. Uji teknis meliputi kecepatan aliran udara, kecepatan minimum fluidisasi, suhu, waktu pengeringan, dan efisiensi ruang pengering. Ruang pengering berbentuk silinder dengan diameter 40 cm, tinggi 200 cm, dan luas alas 0,1256 m2. Kapasitas alat pengering Fluidized Bed sebelum Scale Up adalah 4 kg dan kapasitas setelah Scale Up sebesar 8 kg. Kecepatan aliran udara yang melewati ruang pengering adalah 3 m/s. Sebaran suhu selama proses pengeringan berkisar antara 40-50℃ dan 50-60℃. Berdasarkan hasil penelitian semakin banyak massa yang dikeringkan semakin lama waktu yang dibutuhkan untuk mengeringkan bahan tersebut. Efisiensi ruang pengering yang paling besar terdapat pada kisaran suhu 50-60℃ dengan nilai 94,04%.   Kata kunci: fluidized bed, scale up, uji teknis

EXPERIMENTAL AND ANALYTICAL STUDIES OF VERTICAL AXIS WIND TURBINES

2018 ◽  
pp. 51-58
Author(s):  
B. P. Khozyainov
Keyword(s):  
Wind Turbine ◽  
Flow Velocity ◽  
Wind Power ◽  
Wind Turbines ◽  
Power Efficiency ◽  
Air Flow ◽  
Geometrical Parameters ◽  
Wind Speeds ◽  
Analytical Studies ◽  
Air Flow Velocity

The article carries out the experimental and analytical studies of three-blade wind power installation and gives the technique for measurements of angular rate of wind turbine rotation depending on the wind speeds, the rotating moment and its power. We have made the comparison of the calculation results according to the formulas offered with the indicators of the wind turbine tests executed in natural conditions. The tests were carried out at wind speeds from 0.709 m/s to 6.427 m/s. The wind power efficiency (WPE) for ideal traditional installation is known to be 0.45. According to the analytical calculations, wind power efficiency of the wind turbine with 3-bladed and 6 wind guide screens at wind speedsfrom 0.709 to 6.427 is equal to 0.317, and in the range of speed from 0.709 to 4.5 m/s – 0.351, but the experimental coefficient is much higher. The analysis of WPE variations shows that the work with the wind guide screens at insignificant average air flow velocity during the set period of time appears to be more effective, than the work without them. If the air flow velocity increases, the wind power efficiency gradually decreases. Such a good fit between experimental data and analytical calculations is confirmed by comparison of F-test design criterion with its tabular values. In the design of wind turbines, it allows determining the wind turbine power, setting the geometrical parameters and mass of all details for their efficient performance.

Numerical Study on the Surface Convective Heat Transfer of Mass Concrete Structure

2015 ◽  
Vol 723 ◽  
pp. 992-995
Author(s):  
Biao Li ◽  
Fu Guo Tong ◽  
Chang Liu ◽  
Nian Nian Xi
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Flow Velocity ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Air Flow ◽  
Convective Heat Transfer Coefficient ◽  
Concrete Surface ◽  
Mass Concrete ◽  
Air Flow Velocity

The surface convective heat transfer of mass concrete is an important element of concrete structure temperature effect analysis. Based on coupled Thermal Fluid governing differential equation and finite element method, the paper calculated and analyzed the dependence of the concrete surface convective heat transfer on the air flow velocity and the concrete thermal conductivity coefficient. Results show that the surface convective heat transfer coefficient of concrete is a quadratic polynomial function of the air flow velocity, but influenced much less by the air flow velocity when temperature gradient is dominating in heat transfer. The concrete surface convective heat transfer coefficient increases linearly with the thermal conductivity of concrete increases.

scholarly journals Improving the efficiency of carousel wind turbine using aerodynamic shield

2021 ◽  
Vol 2119 (1) ◽  
pp. 012093
Author(s):  
A F Serov ◽  
V N Mamonov ◽  
A D Nazarov ◽  
N B Miskiv
Keyword(s):  
Kinetic Energy ◽  
Flow Velocity ◽  
Air Flow ◽  
Cylindrical Body ◽  
Vertical Axis ◽  
Rotor Blades ◽  
Heat Generator ◽  
Axis Of Rotation ◽  
Wheel Torque ◽  
Air Flow Velocity

Abstract The problem of increasing the efficiency of using the oncoming air flow for a wind wheel with a vertical axis of rotation, which is a mechanical drive of the wind heat generator, is considered. It is proposed to increase the efficiency of the device by installing an aerodynamic shield for the air flow oncoming the wind wheel. Such a shield is a cylindrical body in which a heat generator is placed. The shield creates an effect of confuser, leading to an increase in the speed and, consequently, in the kinetic energy of the air flow acting on the rotor blades. It is shown experimentally that the presence of an aerodynamic shield under the conditions of the experiments carried out at an incoming air flow velocity of ~ 1 m/s leads to a practical doubling of the wind wheel torque.

scholarly journals Effect of the fuel-air flow velocity on heat release rate of swirling non-premixed methane flames

2019 ◽  
Vol 95 ◽  
pp. 105465 ◽  
Author(s):  
Kuanliang Wang ◽  
Fei Li ◽  
Pengfei Zou ◽  
Xin Lin ◽  
Ronghai Mao ◽  
...  
Keyword(s):  
Heat Release ◽  
Flow Velocity ◽  
Heat Release Rate ◽  
Release Rate ◽  
Air Flow ◽  
Methane Flames ◽  
Air Flow Velocity

scholarly journals The effect of evaporative cooling on climatic parameters in a stable for sows

2014 ◽  
Vol 60 (Special Issue) ◽  
pp. S85-S91 ◽  
Author(s):  
Ľ. Botto ◽  
J. Lendelová ◽  
A. Strmeňová ◽  
T. Reichstädterová
Keyword(s):  
Flow Velocity ◽  
Indoor Air ◽  
Cooling System ◽  
Air Flow ◽  
Evaporative Cooling ◽  
Apparent Temperature ◽  
Climate Index ◽  
Pressure System ◽  
Indoor Air Flow ◽  
Air Flow Velocity

The aim of this study was to find out the effect of indirect evaporative cooling on microclimatic parameters in a stable for sows. A high-pressure system was used for cooling, the nozzles sprayed water into the outside air before its entering into the building. Temperature-humidity index during cooling was higher by 0.9 than in the section without cooling (P < 0.001). Due to low indoor air flow velocity (below 0.18 m/s), a change in apparent temperature by the Comprehensive Climate Index (CCI) was only 1.94°C. It would be possible to provide markedly better cooling effectiveness by increasing the air velocity up to 2 m/s, which may improve the CCI by 19.8% and thus to achieve better environmental conditions for housed sows. The efficiency of evaluated evaporative cooling system was moderate because the nozzles were placed outdoors and only part of humidified and cooled air was drawn into the building through inlet openings, and also because the indoor air-flow velocity was low.

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