Simulation of buoyancy-induced turbulent flow from a hot horizontal jet

El-Amin, Mohamed F.; Sun, Shuyu; Salam, Amgad

doi:10.1016/s1001-6058(14)60012-3

Cited by 14 publications

(4 citation statements)

References 11 publications

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“…Equations ( 1) and ( 2) represent the Reynolds-averaged Navier-Stokes equations (RANS); Equation (3) represents the energy equation; and Equations ( 4) and ( 5) represent the turbulence equations. The mathematical model is described using the RANS and energy and the realizable k-turbulent equations [41][42][43][44][45]. The governing partial differential equations with their algebraic constraints are listed below.…”

Section: Mathematical Modelingmentioning

confidence: 99%

Inward and Outward Opening Properties of One-Sided Windcatchers: Experimental and Analytical Evaluation

El-Amin

2022

Sustainability

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Vernacular measures, such as courtyard, wind catcher “Malqaf”, wooden lattice “Mashrabia”, and lantern—which can help buildings to depend on natural energy from the sun and the wind—have started to be abandoned in the last decades. However, wind pressure and stack effects are becoming more popular in modern buildings design and the primary method in most domestic buildings to achieve the desired cross ventilation and minimize the air temperature to reach the required cooling loads. This paper aims to revive one of the vernacular measures “the windcatcher”, quantifying the effectiveness of the inward/outward opening properties on the air temperature and airflow inside the buildings. Analytical literature review, context analysis, and numerical simulations are performed. The computer fluid dynamics (CFD) is utilized to simulate both the temperature distribution and the flow field within the windcatcher model. Simulations are carried out in the fluent environment, which uses the control volume method for solving the conservation law. The Reynolds-averaged Navier–Stokes (RANS) and energy equation with the realizable k-ϵ turbulent model are employed. The research uses a parametric analysis to test different scenarios of windcatcher designs in terms of dimensions, proportions, and opening ratios. The results of this study confirm that windcatcher has a significant effect in lowering the air temperature inside the different floors. However, it is recommended to use a wind-catcher for not more than two floors, increase the area of the outward opening to 200% relative to the inward opening and apply side opening in the upper floors.

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Section: Mathematical Modelingmentioning

confidence: 99%

Inward and Outward Opening Properties of One-Sided Windcatchers: Experimental and Analytical Evaluation

El-Amin

2022

Sustainability

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“…Dai 8 established a jet model under the effect of multiple plumes and derived the non-dimensional trajectory equation of the jet. El-Amin et al 9 revealed the stratification phenomena and buoyancy effects due to temperature difference and density variation in a rectangular storage tank.…”

Section: Introductionmentioning

confidence: 99%

“…El-Amin et al. 9 revealed the stratification phenomena and buoyancy effects due to temperature difference and density variation in a rectangular storage tank.…”

Section: Introductionmentioning

confidence: 99%

Assessing the interaction of air from a jet diffuser on a thermal plume in a room using two-dimensional particle image velocimetry

Wang

Huang

et al. 2019

Building Services Engineering Research and Technology

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Traditional design of airflow distributions in large spaces does not consider the interference of thermal plumes on jets. In order to quantitatively describe the indoor environment, it is first necessary to quantify how the airflow gets distributed. In this study, a two-dimensional particle image velocimetry (PIV) system for measuring a wide indoor flow field was established. A total of 24 sub-regions (each with a size of 400 mm × 350 mm) were accurately measured in an unmanned room, and the overall cross-sectional flow field was obtained by splicing. Uncertainty analysis proved the rationality of this experimental method. According to the damage extent of the jet structure introduced by the thermal plume, two groups were divided, i.e. Groups A and B. The distribution of velocity fields, trajectories and velocity attenuation of jet centerlines, and velocity magnitude profiles at nozzle and head levels were compared and analyzed in detail. Through this investigation, detailed information of indoor air flow in large spaces can be effectively characterized, which can be useful to help understand the indoor physics and validate CFD models. Practical application: The key to creating a comfortable and healthy indoor thermal environment is the rational design of the airflow distribution. This paper proposes a method for quantitatively describing the airflow distribution in an enclosed space. The equation of the non-dimensional velocity attenuation of jet centerlines is obtained by using advanced technology (PIV), which provides theoretical basis and useful reference for the design of airflow distribution.

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“…El-Amin et al [1] investigated the 2D upward, axisymmetric turbulent confined jet and developed several models to describe flow patterns using realizable k −ε turbulence model. Furthermore, CFD analysis of the flow structure of a horizontal water injected jet into a rectangular tank has been done by El-Amin et al [2]. Their findings were later used by Panthalookaran et al [3] to calibrate both realizable and RNG k −ε turbulence models so that they may be used for simulating stratified hot water storage tanks.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation and analysis of confined turbulent buoyant jet with variable source

et al. 2015

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In this work, experimental and numerical investigations are considered for confined buoyant turbulent jet with varying inlet temperatures. Results of the experimental work and numerical simulations for the problem under consideration are presented. Four cases of different variable inlet temperatures and different flow rates are considered. The realizable k −ε turbulence model is used to model the turbulent flow. Comparisons show good agreements between simulated and measured results. The average deviation of the simulated temperature by realizable k −ε turbulent model and the measured temperature is within 2%. The results indicate that temperatures along the vertical axis vary, generally, in nonlinear fashion as opposed to the approximately linear variation that was observed for the constant inlet temperature that was done in a previous work. Furthermore, thermal stratification exits particularly closer to the entrance region. Further away from the entrance region the variation in temperatures becomes relatively smaller. The stratification is observed since the start of the experiment and continues during whole time. Numerical experiments for constant, monotone increasing and monotone decreasing of inlet temperature are done to show its effect on the buoyancy force in terms of Richardson number.

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Simulation of buoyancy-induced turbulent flow from a hot horizontal jet

Cited by 14 publications

References 11 publications

Inward and Outward Opening Properties of One-Sided Windcatchers: Experimental and Analytical Evaluation

Inward and Outward Opening Properties of One-Sided Windcatchers: Experimental and Analytical Evaluation

Assessing the interaction of air from a jet diffuser on a thermal plume in a room using two-dimensional particle image velocimetry

Numerical simulation and analysis of confined turbulent buoyant jet with variable source

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