Modeling Jet Drop Distances for Control of a Nonisothermal, Flap-adjusted Ventilation Jet

Ammonia and greenhouse gas emissions from fattening pig house with two types of partial pit ventilation systems

“…There was a large return flow near the animal occupied zone. The airflow pattern agreed with the free jet drop model developed by Zhang et al (1996). A small proportion of short circuiting of incoming air to room exhaust openings occurred in both systems.…”

“…The ventilation system of animal houses has a significant influence on local thermal conditions and gaseous release (Barber and Ogilvie, 1982;Zhang et al, 1996). Meanwhile, the dispersion and deposition of gaseous contaminants are mostly affected by airflow inside the livestock building (Zhang and Strom, 1999;Morsing et al, 2008).…”

Scale model study of airflow performance in a ceiling slot-ventilated enclosure: Non-isothermal condition

“…Representations of the separation distance of linear jet or impingement distance from inlet wall were related to Archimedes number Ar ¼ bghðT f À T d Þ=U 2 d [2][3][4][5]. Air-jet penetration has been used to express airflow patterns quantitatively.…”

Computational fluid dynamics analysis of the thermal distribution of animal occupied zones using the jet-drop-distance concept in a mechanically ventilated broiler house

“…Zhang, Strom, and Morsing (1992) introduced the concept of "jet-drop-distance", which describes the horizontal distance from the slotopenings to the location where the incoming cold air reaches the AOZ. Zhang, Morsing, and Strom (1996) and Zhang and Strom (1999) suggested the "jet-drop-distance model" could establish a technical methodology to control the jet trajectory using experimental variables including the Archimedes number and the corrected Archimedes number from a laboratory-scaled chamber experiment. The study of Zhang et al (1996) showed that the flow pattern of incoming air could be affected by various physical parameters, such as the thermal energy of the incoming air mass, the pressure difference in the vicinity of the slot openings, the internal air temperature and the aerodynamic properties of the slot openings.…”

“…Zhang, Morsing, and Strom (1996) and Zhang and Strom (1999) suggested the "jet-drop-distance model" could establish a technical methodology to control the jet trajectory using experimental variables including the Archimedes number and the corrected Archimedes number from a laboratory-scaled chamber experiment. The study of Zhang et al (1996) showed that the flow pattern of incoming air could be affected by various physical parameters, such as the thermal energy of the incoming air mass, the pressure difference in the vicinity of the slot openings, the internal air temperature and the aerodynamic properties of the slot openings. They proposed two non-linear regression equations that explained the relationship between the jet-drop-distance and the jet-drop-factor and the corrected Archimedes number (Zhang et al, 1996;Zhang & Strom, 1999).…”