Experimental measurements and numerical simulations of particle transport and distribution in ventilated rooms

Zhang, Z.; Chen, Qingyan

doi:10.1016/j.atmosenv.2006.01.014

Cited by 313 publications

(186 citation statements)

References 21 publications

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“…This study also shows that a cabin environment is similar to a building environment as they both are ventilated and enclosed spaces. Therefore, the integrated CFD tool presented in the paper for airflow and contaminant transportation modeling can be also applied to building environment upon appropriate validations [13][14][15].…”

Section: Discussionmentioning

confidence: 99%

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Experimental and numerical investigation of airflow and contaminant transport in an airliner cabin mockup

Zhang

Chen

Mazumdar

et al. 2009

Building and Environment

274

159

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The study of airflow and contaminant transport in airliner cabins is very important for creating a comfortable and healthy environment. This paper shows the results of such a study by conducting experimental measurements and numerical simulations of airflow and contaminant transport in a section of half occupied, twin-aisle cabin mockup. The air velocity and air temperature were measured by ultrasonic and omni-directional anemometers. A gaseous contaminant was simulated by a tracer gas, sulfur hexafluoride or SF 6 , and measured by a photoacoustic multi-gas analyzer. A particulate contaminant was simulated by 0.7 μm Di-Ethyl-HexylSebacat (DEHS) particles and measured by an optical particle sizer. The numerical simulations used the Reynolds averaged Navier-Stokes equations based on the RNG k-ε model to solve the air velocity, air temperature, and gas contaminant concentration; and employed a Lagrangian method to model the particle transport. The numerical results quantitatively agreed with the experimental data while some remarkable differences exist in airflow distributions. Both the experimental measurements and computer simulations were not free from errors. A complete and accurate validation for a complicated cabin environment is challenging and difficult.

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Section: Discussionmentioning

confidence: 99%

“…The PSI-C method could successfully convert the particle trajectories into a stable concentration field if significant number of particles was tracked and analyzed. The stability and the viability of the integrated Lagrangian method and the PSI-C model have been stated and validated by Zhang and Chen [13].…”

Section: Methodsmentioning

confidence: 99%

Experimental and numerical investigation of airflow and contaminant transport in an airliner cabin mockup

Zhang

Chen

Mazumdar

et al. 2009

Building and Environment

274

159

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“…However, the performance of the Lagrangian method is very sensitive to the accuracy of the predicted mean flow and turbulence, particularly near walls. The strict requirement on near-wall flow and turbulence modeling challenges the modeling capacity of many Reynolds-averaged-Navier-Stokes (RANS) models (Zhao et al, 2004;Zhang and Chen, 2006).…”

Section: Brief Review Of Modeling Methods Of Predicting Indoor Particmentioning

confidence: 99%

Prediction of particle deposition onto indoor surfaces by CFD with a modified Lagrangian method

Zhang¹,

Chen²

2009

Atmospheric Environment

Self Cite

163

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Accurate prediction of particle deposition indoors is important to estimate exposure risk of building occupants to particulate matter. The prediction requires accurate modeling of airflow, turbulence, and interactions between particles and eddies close to indoor surfaces. This study used a 2 ′ − v f turbulence model with a modified Lagrangian method to predict the particle deposition in enclosed environments. The 2 ′ − v f model can accurately calculate the normal turbulence fluctuation 2 ′ v , which mainly represents the anisotropy of turbulence near walls.Based on the predicted 2 ′ v , we proposed an anisotropic particle-eddy interaction model for the prediction of particle deposition by the Lagrangian method. The model performance was assessed by comparing the computed particle deposition onto differently oriented surfaces with the experimental data in a turbulent channel flow and in a naturally convected cavity available from the literature. The predicted particle deposition velocities agreed reasonably with the experimental data for different sizes of particles ranging from 0.01μm to 50μm in diameter. This study concluded that the Lagrangian method can predict indoor particle deposition with reasonable accuracy provided the near-wall turbulence and its interactions with particles are correctly modeled.

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“…For example, a reliable determination of air flow at speeds less than 0.1 m/s is not a trivial task even with the use of modern measuring equipment [5]. It is also complicated to measure simultaneously a number of environmental parameters in the entire volume because it requires synchronous operation of a large array of sensors.…”

Section: Methodsmentioning

confidence: 99%

The stratification study of public buildings microclimate parameters with supply and exhaust ventilation

2017

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Abstract. The paper presents the results of the UFAD system numerical modeling where the air is supplied through diffusers installed in a floor of a room. Warm air is removed from the upper zone of the room through the exhaust duct. The purpose of this study is to determine the magnitude of the temperature stratification in various areas of an office premise in the conditions of the under floor air distribution. Enclosed volume with local heat sources has been chosen as the computational domain: people, computers, and lighting. The problem is solved in a stationary setting using the k-omega SST turbulence model. As a result of the study the temperature distribution throughout the room has been obtained and the influence dependence of wall temperature on an average air temperature in the room has been defined. The numerical data received are in good agreement with the results of the borrowed experimental study that demonstrate the adequacy of the developed numerical model as well as the possibility of its further use for the optimization of the considered ventilation systems.

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Experimental measurements and numerical simulations of particle transport and distribution in ventilated rooms

Cited by 313 publications

References 21 publications

Experimental and numerical investigation of airflow and contaminant transport in an airliner cabin mockup

Experimental and numerical investigation of airflow and contaminant transport in an airliner cabin mockup

Prediction of particle deposition onto indoor surfaces by CFD with a modified Lagrangian method

The stratification study of public buildings microclimate parameters with supply and exhaust ventilation

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