Effects of Negatively Sloped Jet Inclination Angle and Other Parameters on Air Curtain Performance

2009 ◽  
Author(s):  
Samir R. Traboulsi ◽  
Ali H. Hammoud ◽  
M. Farid Khalil
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Shear Layer ◽  
Latent Heat ◽  
Inclination Angle ◽  
Heat Load ◽  
The Other ◽  
Air Curtain ◽  
Air Jet ◽  
Computational Fluid Dynamics Cfd

Tilted air jet planes are used as barriers between two environments of different temperature, humidity and quality. Entrainment of one environment fluid (air) into the curtain by shear layer mixing contributes to both the sensible and the latent heat load on the other environment and the impingement of the air curtain formed. Perturbation of one side affects the shape of the air jet and might endanger its integrity. Protrusion present in the direction of the flow impacts the performance of the air curtain and defeats its purpose of existence. Computational Fluid Dynamics (CFD) – Fluent 6.3.26® method is used to evaluate the performance of the air curtain formed by negatively sloped tilted jet plane and is also validated by comparing the CFD calculations results with experimental results. Qualitative design combination of various parameters and various levels of obstruction in the direction of the flow(s) are proposed to achieve optimal performance of the air curtain.

scholarly journals Review on Condenser Heat Transfer of Computational FluidDynamic System Using ANSYS

2021 ◽  
Vol 10 (2) ◽  
pp. 63-68
Author(s):  
Shweta Pal ◽  
◽  
Arun Kumar Wamankar ◽  
Sailendra Dwivedi
Keyword(s):  
Heat Transfer ◽  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Latent Heat ◽  
Heat Content ◽  
Petroleum Engineering ◽  
Condensation Process ◽  
Liquid Form ◽  
Whole Process ◽  
Computational Fluid Dynamics Cfd

Condenser is a high pressure side heat exchanger in which heated vapor enters and gets converted into liquid form by condensation process. In the condenser coil, gaseous substance is condensed into liquid by transferring latent heat content present in it to the surrounding. In the whole process, mode of heat transfer is conduction in condenser coil and forced convection between refrigerant and condenser. Any refrigeration system's backbone is comprised of condensers. It aids in the transfer of heat from the refrigerant to the universal sink, which is the atmosphere. The latent heat of the refrigerant is lost in the condenser. At the entry of the condenser, vapours from the compressor enter, and during the length of the condenser, the vapours are converted to liquid form, resulting in refrigerant in the form of saturated or even sub-cooled liquid form at the condenser's exit. In several sectors of chemical and petroleum engineering, computational fluid dynamics (CFD) is a common tool for simulating flow systems. As a branch of fluid mechanics, computational fluid dynamics (CFD) is an appropriate tool for investigating and modelling the ANSYS Program. The applicability of CFD studies for simulating the ANSYS Program was reviewed in this work. Ansys CFD is one of the industry's most powerful simulation packages

CFD-modeling for more precise operation of the kraft recovery boiler

TAPPI Journal ◽  
2012 ◽  
Vol 11 (11) ◽  
pp. 19-27 ◽  
Author(s):  
MARKUS ENGBLOM ◽  
PASI MIIKKULAINEN ◽  
ANDERS BRINK ◽  
MIKKO HUPA
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
The Other ◽  
Cfd Modeling ◽  
Furnace Temperature ◽  
Model Predictions ◽  
Boiler Operation ◽  
Computational Fluid Dynamics Cfd ◽  
Recovery Boiler ◽  
Temperature Asymmetry

During kraft recovery boiler operation, situations can be encountered where the furnace temperature is asymmetric when comparing one side of the furnace to the other (i.e., left vs. right). In this paper, computational fluid dynamics (CFD) modeling is applied to study furnace load and liquor spraying as causes for asymmetric furnace temperatures in a 4450 tons dry solids (TDS)/day kraft recovery boiler. The model predictions are compared against validation measurements. Decrease in furnace load is identified as the main cause of the temperature asymmetry. The simulations also suggest that, at decreased load, relatively small differences in the tilts of individual liquor sprays can increase the temperature asymmetry.

CFD Simulation of Hydraulics of Dividing Wall Sieve Trays

2012 ◽  
Vol 476-478 ◽  
pp. 1345-1350
Author(s):  
Yan Wang ◽  
Song Du ◽  
Huai Gong Zhu ◽  
He Xu Ma ◽  
Shao Qing Zuo
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Cfd Simulation ◽  
The Other ◽  
Phase Flow ◽  
Cfd Model ◽  
Two Phase ◽  
Sieve Tray ◽  
Commercial Scale ◽  
Computational Fluid Dynamics Cfd

A 3D two-phase flow computational fluid dynamics (CFD) model containing gas mal-distribution is developed in the Eulerian framework to predict the hydraulics of a dividing wall sieve tray. Variable and position dependent gas superficial velocity is used in the calculation. Using water-air system, simulations of flow patterns and hydraulics of a commercial- scale 1.2m diameter sieve tray are carried out using this model to testify its precision. Then, the same simulations of a dividing wall sieve tray with equal diameter are carried out. The results show that there are two backflow regions on a dividing wall tray, one is in the segmental area, and the other is in the region nearby junction of dividing wall and outlet weir. In the segmental area of trays with equal diameter, the area of backflow region of dividing wall trays is basically equal to that of conventional trays.

Hydrodynamic and Heat Transfer Effects of Varying Sparger Spacing Within a Column Photobioreactor Using Computational Fluid Dynamics

2015 ◽  
Vol 12 (1) ◽  
Author(s):  
Ghazi S. Bari ◽  
Taylor N. Suess ◽  
Gary A. Anderson ◽  
Stephen P. Gent
Keyword(s):  
Heat Transfer ◽  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
The Other ◽  
Transfer Effects ◽  
Computational Fluid Dynamics Cfd ◽  
Heat Transfer Effects

This research investigates the placement of spargers on thermofluid effects within a column photobioreactor (PBR) using computational fluid dynamics (CFD). This study compares two configurations, each with three rows of spargers spaced at different widths: one with spargers spaced 7.62 cm apart and the other spaced 10.16 cm apart. These spargers are modeled in a PBR with overall dimensions of 34.29 cm in length, 15.25 cm in width, and 34.28 cm in height. The objective of this research is to predict the performance of PBRs using CFD, which can be used to improve the design of PBRs used to grow microalgae for biofuels and bioproducts.

scholarly journals Numerical and One-Dimensional Studies of Supersonic Ejectors for Refrigeration Application: The Significance of Wall Pressure Variation in the Converging Mixing Section

2021 ◽  
Vol 11 (7) ◽  
pp. 3245
Author(s):  
Eldwin Djajadiwinata ◽  
Shereef Sadek ◽  
Shaker Alaqel ◽  
Jamel Orfi ◽  
Hany Al-Ansary
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Experimental Work ◽  
Pressure Variation ◽  
The Other ◽  
Dimensional Model ◽  
Cfd Simulations ◽  
One Dimensional ◽  
Supersonic Ejector ◽  
Computational Fluid Dynamics Cfd

This paper studies the pressure variation that exists on the converging mixing section wall of a supersonic ejector for refrigeration application. The objective is to show that the ejector one-dimensional model can be improved by considering this wall’s pressure variation which is typically assumed constant. Computational Fluid Dynamics (CFD) simulations were used to obtain the pressure variation on the aforementioned wall. Four different ejectors were simulated. An ejector was obtained from a published experimental work and used to validate the CFD simulations. The other three ejectors were a modification of the first ejector and used for the parametric study. The secondary mass flow rate,

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