Computational fluid dynamics modeling of ventilation of confined-space manure storage facilities: Applications

Juan Zhao, Harvey B. Manbeck, Dennis J. Murphy

Research output: Contribution to specialist publicationArticle

2 Citations (Scopus)

Abstract

Fatalities associated with entry into on-farm confined-space manure storage tanks occur each year. The fatalities are due to asphyxiation or poisoning by exposure to high concentrations of hydrogen sulfide, methane, and carbon dioxide. Forced ventilation has been shown to be an effective way to reduce concentrations of these noxious gases to levels that are safe for human entry into these storage tanks. Hydrogen sulfide (H2S) was used as an indicator gas to investigate the effectiveness of forced ventilation strategies for eliminating the toxic and oxygen-deficient atmospheres in confined-space manure tanks. Validated computational fluid dynamics (CFD) modeling protocols were used to simulate H2S evacuation from fan-ventilated manure tanks. The simulation studies were conducted for rectangular and circular manure tanks, and the effects of pollutant source, inter-contamination (process by which a portion of exhausted contaminant gas enters a ventilated confined airspace through the fresh air intake), storage size (i.e., length, diameter), and air exchange rate on H2S removal from fan-ventilated manure tanks were investigated. For the same air exchange rate, as the size (i.e., length, diameter) of the tank increased, the rate of evacuation of the H2S from the confined space decreased. For rectangular and circular manure tanks, the higher the air exchange rate, the higher the rate of evacuation of the H2S from the confined space. For the rectangular tank geometries and ventilation system layouts simulated, evacuation times decreased exponentially with air exchange rate. Evacuation times for the circular tanks simulated decreased linearly with air exchange rate.

Original languageEnglish (US)
Pages405-429
Number of pages25
Volume14
No4
Specialist publicationJournal of Agricultural Safety and Health
StatePublished - Dec 1 2008

Fingerprint

Confined Spaces
manure storage
Manure
Manures
Hydrodynamics
Ventilation
Computational fluid dynamics
fluid mechanics
Air
animal manures
Hydrogen Sulfide
Gases
air
Hydrogen sulfide
Fans
hydrogen sulfide
fans (equipment)
gases
Poisons
Air intakes

All Science Journal Classification (ASJC) codes

  • Safety, Risk, Reliability and Quality
  • Agricultural and Biological Sciences(all)
  • Public Health, Environmental and Occupational Health

Cite this

@misc{72e9b78423c4430196af739992508a0c,
title = "Computational fluid dynamics modeling of ventilation of confined-space manure storage facilities: Applications",
abstract = "Fatalities associated with entry into on-farm confined-space manure storage tanks occur each year. The fatalities are due to asphyxiation or poisoning by exposure to high concentrations of hydrogen sulfide, methane, and carbon dioxide. Forced ventilation has been shown to be an effective way to reduce concentrations of these noxious gases to levels that are safe for human entry into these storage tanks. Hydrogen sulfide (H2S) was used as an indicator gas to investigate the effectiveness of forced ventilation strategies for eliminating the toxic and oxygen-deficient atmospheres in confined-space manure tanks. Validated computational fluid dynamics (CFD) modeling protocols were used to simulate H2S evacuation from fan-ventilated manure tanks. The simulation studies were conducted for rectangular and circular manure tanks, and the effects of pollutant source, inter-contamination (process by which a portion of exhausted contaminant gas enters a ventilated confined airspace through the fresh air intake), storage size (i.e., length, diameter), and air exchange rate on H2S removal from fan-ventilated manure tanks were investigated. For the same air exchange rate, as the size (i.e., length, diameter) of the tank increased, the rate of evacuation of the H2S from the confined space decreased. For rectangular and circular manure tanks, the higher the air exchange rate, the higher the rate of evacuation of the H2S from the confined space. For the rectangular tank geometries and ventilation system layouts simulated, evacuation times decreased exponentially with air exchange rate. Evacuation times for the circular tanks simulated decreased linearly with air exchange rate.",
author = "Juan Zhao and Manbeck, {Harvey B.} and Murphy, {Dennis J.}",
year = "2008",
month = "12",
day = "1",
language = "English (US)",
volume = "14",
pages = "405--429",
journal = "Journal of Agricultural Safety and Health",
issn = "1074-7583",
publisher = "American Society of Agricultural and Biological Engineers",

}

Computational fluid dynamics modeling of ventilation of confined-space manure storage facilities : Applications. / Zhao, Juan; Manbeck, Harvey B.; Murphy, Dennis J.

In: Journal of Agricultural Safety and Health, Vol. 14, No. 4, 01.12.2008, p. 405-429.

Research output: Contribution to specialist publicationArticle

TY - GEN

T1 - Computational fluid dynamics modeling of ventilation of confined-space manure storage facilities

T2 - Applications

AU - Zhao, Juan

AU - Manbeck, Harvey B.

AU - Murphy, Dennis J.

PY - 2008/12/1

Y1 - 2008/12/1

N2 - Fatalities associated with entry into on-farm confined-space manure storage tanks occur each year. The fatalities are due to asphyxiation or poisoning by exposure to high concentrations of hydrogen sulfide, methane, and carbon dioxide. Forced ventilation has been shown to be an effective way to reduce concentrations of these noxious gases to levels that are safe for human entry into these storage tanks. Hydrogen sulfide (H2S) was used as an indicator gas to investigate the effectiveness of forced ventilation strategies for eliminating the toxic and oxygen-deficient atmospheres in confined-space manure tanks. Validated computational fluid dynamics (CFD) modeling protocols were used to simulate H2S evacuation from fan-ventilated manure tanks. The simulation studies were conducted for rectangular and circular manure tanks, and the effects of pollutant source, inter-contamination (process by which a portion of exhausted contaminant gas enters a ventilated confined airspace through the fresh air intake), storage size (i.e., length, diameter), and air exchange rate on H2S removal from fan-ventilated manure tanks were investigated. For the same air exchange rate, as the size (i.e., length, diameter) of the tank increased, the rate of evacuation of the H2S from the confined space decreased. For rectangular and circular manure tanks, the higher the air exchange rate, the higher the rate of evacuation of the H2S from the confined space. For the rectangular tank geometries and ventilation system layouts simulated, evacuation times decreased exponentially with air exchange rate. Evacuation times for the circular tanks simulated decreased linearly with air exchange rate.

AB - Fatalities associated with entry into on-farm confined-space manure storage tanks occur each year. The fatalities are due to asphyxiation or poisoning by exposure to high concentrations of hydrogen sulfide, methane, and carbon dioxide. Forced ventilation has been shown to be an effective way to reduce concentrations of these noxious gases to levels that are safe for human entry into these storage tanks. Hydrogen sulfide (H2S) was used as an indicator gas to investigate the effectiveness of forced ventilation strategies for eliminating the toxic and oxygen-deficient atmospheres in confined-space manure tanks. Validated computational fluid dynamics (CFD) modeling protocols were used to simulate H2S evacuation from fan-ventilated manure tanks. The simulation studies were conducted for rectangular and circular manure tanks, and the effects of pollutant source, inter-contamination (process by which a portion of exhausted contaminant gas enters a ventilated confined airspace through the fresh air intake), storage size (i.e., length, diameter), and air exchange rate on H2S removal from fan-ventilated manure tanks were investigated. For the same air exchange rate, as the size (i.e., length, diameter) of the tank increased, the rate of evacuation of the H2S from the confined space decreased. For rectangular and circular manure tanks, the higher the air exchange rate, the higher the rate of evacuation of the H2S from the confined space. For the rectangular tank geometries and ventilation system layouts simulated, evacuation times decreased exponentially with air exchange rate. Evacuation times for the circular tanks simulated decreased linearly with air exchange rate.

UR - http://www.scopus.com/inward/record.url?scp=58149340884&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=58149340884&partnerID=8YFLogxK

M3 - Article

C2 - 19044169

AN - SCOPUS:58149340884

VL - 14

SP - 405

EP - 429

JO - Journal of Agricultural Safety and Health

JF - Journal of Agricultural Safety and Health

SN - 1074-7583

ER -