Jet Drop Models for Control of Non-Isothermal Free Jets in a Side-Wall Multi-Inlet Ventilation System

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

“…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).…”

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.…”

“…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).…”

“…A jet-drop-distance model was proposed to establish a plan for the control and management of a cold jet trajectory by Zhang & Strom (1999), Transactions of the ASAE, 42(4), 1121e1126. Jet-drop-distance is defined as the horizontal distance from a wall to an animal occupied zone where the incoming cold air first reaches at.…”

“…Here, computational fluid dynamics (CFD) was adopted to overcome the experimental limitations and to analyse jet-drop-distances qualitatively and quantitatively in a commercial broiler house with multiple slot-openings. Predictions of jet-drop-distances were computed using the experimental conditions used by Zhang & Strom (1999) and compared with their regression models to validate the accuracy of developed method. In the validation test, the regression model using the corrected Archimedes number more accurately predicted the jet-drop-distance in the simulation model (R 2 ¼ 0.90).…”