scholarly journals VENTILATION METHOD FOR LONG BLIND DRIFTS WITH LONGITUDINAL BAFFLES

2021 ◽  
Vol 2 (4) ◽  
pp. 22-31
Author(s):  
Stanislav A. Pavlov
Keyword(s):  
Numerical Modeling ◽  
Air Flow ◽  
Velocity Variation ◽  
Air Distribution ◽  
Opening Angle ◽  
Forced Ventilation ◽  
Air Drag ◽  
Ventilation Efficiency ◽  
Air Flows ◽  
Ventilation Method

The study focuses on aerodynamic processes in long blind drifts ventilated owing to ejection effect generated thanks to construction of longitudinal baffles. The numerical modeling of air distribution at the junction with a blind drift with a longitudinal baffle is implemented in ANSYS. The change in the local air drag in case of forward and reverse air flows is shown. The velocity variation in air flow in a long blind drift with adjustment of ventilation efficiency by alteration of the opening angle of the longitudinal baffle flap is estimated. Based on the obtained results, the author shows that construction of longitudinal baffles allows efficient ventilation in long blind drifts owing to the ejection effect, without forced ventilation arrangement.

scholarly journals Fill ventilation of heated corn grain

2020 ◽  
pp. 74-77
Author(s):  
Mikhail Gennadievich Zagoruyko ◽  
Sergey Anatolyevich Pavlov
Keyword(s):  
Experimental Data ◽  
Distribution System ◽  
Air Flow ◽  
Air Distribution ◽  
The Dead ◽  
Over Time ◽  
Corn Grain

The grain masses of the first and subsequent batches, the equivalent coefficient of the dead gap of the air distribution system are calculated, the expressions for calculating the air flow for these batches and the experimental data on the change in moisture and temperature of the grain over time are given.

Numerical Modeling of Air Flow in a Cabinet Dryer Equipped by Deflector Plates

2019 ◽  
Vol 15 (10) ◽  
Author(s):  
Omid Reza Roustapour ◽  
Hamid Reza Gazor ◽  
Kazemi Farzin
Keyword(s):  
Fluid Dynamics ◽  
Numerical Modeling ◽  
Air Flow ◽  
Outlet Temperature ◽  
Governing Equations ◽  
Air Velocity ◽  
Drying Time ◽  
Elapsed Time ◽  
Quadrilateral Elements ◽  
Simulation Results

AbstractIn this study, air deflector plates were used in order to increase the air elapsed time in the chamber. The air flow pattern was simulated using computational fluid dynamics. The geometry of the chamber was produced in 2D and meshed by triangular and quadrilateral elements, boundary conditions were defined and the governing equations solved. Modeling of flow without any deflectors depicted the air flowed to the chamber conducted to the outlet without any distortion. Air vortices were generated when the deflectors defined in model. To evaluate the influence of deflectors on drying period, constructed plates installed in the dryer chamber and melon slices were dried when deflectors used or not. Simulation results showed magnitude of the air velocity was increased and temperature uniform distribution developed on the surface of trays. The outlet temperature was also decreased up to 10 % and drying time reduced to 22 % when the deflectors were employed.

Air Flow Modelling of a Multi-Storey Office Building

2013 ◽  
Vol 361-363 ◽  
pp. 833-844
Author(s):  
Chong Jie Wang ◽  
Wei Wei Liu
Keyword(s):  
Temperature Distribution ◽  
Natural Ventilation ◽  
Air Flow ◽  
Comfort Level ◽  
Office Building ◽  
Temperature Stratification ◽  
Air Distribution ◽  
Flow Modelling ◽  
Ventilation Strategies

Indoor fresh air distribution, temperature stratification and temperature distribution are consider to be the essential indicators when comes to evaluation of the comfort level for internal ventilation environment, particularly for natural ventilated space as target office building. It can be identified that the targeting building has been well designed in the respect of natural ventilation strategies where both cross and stack strategies have been adopted, but it is also obvious that under combined buoyancy and wind driven mode alternative problems appears.

scholarly journals CFD study on the effects of boundary conditions on air flow through an air-cooled condenser

2018 ◽  
Vol 180 ◽  
pp. 02103
Author(s):  
Zdeněk Sumara ◽  
Michal Šochman
Keyword(s):  
Velocity Field ◽  
Boundary Conditions ◽  
Air Flow ◽  
Virtual Model ◽  
Numerical Schemes ◽  
Rans Equations ◽  
Uniform Velocity ◽  
Flow Through ◽  
Air Flows ◽  
Turbulent Models

This study focuses on the effects of boundary conditions on effectiveness of an air-cooled condenser (ACC). Heat duty of ACC is very often calculated for ideal uniform velocity field which does not correspond to reality. Therefore, this study studies the effect of wind and different landscapes on air flow through ACC. For this study software OpenFOAM was used and the flow was simulated with the use of RANS equations. For verification of numerical setup a model of one ACC cell with dimensions of platform 1.5×1.5 [m] was used. In this experiment static pressures behind fan and air flows through a model of surface of condenser for different rpm of fan were measured. In OpenFOAM software a virtual clone of this experiment was built and different meshes, turbulent models and numerical schemes were tested. After tuning up numerical setup virtual model of real ACC system was built. Influence of wind, landscape and height of ACC on air flow through ACC has been investigated.

Study on Blasting Driving Roadway Single Transformation Ejector Auxiliary Ventilation

2011 ◽  
Vol 228-229 ◽  
pp. 836-840 ◽  
Author(s):  
Jian Yong Han ◽  
Peng Xu
Keyword(s):  
Air Flow ◽  
Good Effect ◽  
Analysis Software ◽  
Small Section ◽  
Fluid Analysis ◽  
Two Phases ◽  
Ventilation Method

Faced with the serious pollution problems of blasting smoke after blasting with the ventilation method based on pressure, using single transformation ejector auxiliary ventilation was raised in the paper, namely ventilation based on pressure was put into use when it was normal, but ejector auxiliary ventilation was used after blasting. The simulation of the condition by fluid analysis software when ejector auxiliary ventilation and ventilation method based on pressure were conducted, and a inclusion was presented that ejector auxiliary ventilation had a good effect on exhausting smoke for the long tunnel with small section, and it has an advantage of shortening exhausting smoke time and less pollution to the roadway, Ventilation can be divided into two phases, when the ejector inlet is submerged in the smoke, smoke is suck out mainly through ventiduct. when the ejector inlet is exposed to fresh air flow, the ejetor assist smoke get out through ventiduct.

A Study on Evaluation of ADPI and Ventilation Performance of a Small Auditorium with Unevenly Arranged Return Diffusers

2017 ◽  
Vol 25 (04) ◽  
pp. 1750029
Author(s):  
Yong-il Kwon
Keyword(s):  
Distribution System ◽  
Distribution Systems ◽  
Numerical Study ◽  
Side Wall ◽  
Air Distribution ◽  
Rear Wall ◽  
System Parameters ◽  
Ventilation Efficiency ◽  
Ventilation Performance ◽  
Air Diffusion

The ventilation performance and thermal comfort characteristics on placing the supply or return diffusers for the air distribution systems applied to an auditorium with high ceiling heights must be inherently considered. A numerical study has been conducted to simulate the airflow and ventilation characteristics in a small auditorium with the uniformly installed supply diffusers on the ceiling surface, and with the unevenly installed return diffusers on the side wall of the stage, the left and rear wall. It is the objective of the present study to investigate the effects of various air distribution system parameters on air diffusion performance index (ADPI), air change efficiency and scale of ventilation efficiency NO.4 (SVE4) of return diffusers in the auditorium with the movable audience seat on the flat floor. This paper focuses mainly on the effect of the unevenly installed return diffusers on the low part of the side wall of the auditorium with the movable audience seat.

scholarly journals NUMERICAL MODELING OF AN ASCENDING AIR FLOW WITH PARTICLES OF BIOFUEL

2017 ◽  
Vol 39 (5) ◽  
pp. 84-90
Author(s):  
B. I. Basok ◽  
B. V. Davydenko ◽  
V. G. Novikov ◽  
S. M. Goncharuk
Keyword(s):  
Numerical Modeling ◽  
Air Flow

В работе представлены результаты численного моделирования восходящего течения воздуха с твердыми частицами биотоплива в канале с переменным сечением. Определены особенности движения частиц и их динамические характеристики в зависимости от скорости воздушного потока на входе в канал.

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