CFD simulation of airflow inside tree canopies discharged from air-assisted sprayers

Hong, Suk-Jin; Zhao, Lingying; Zhu, Heping

doi:10.1016/j.compag.2017.07.011

Cited by 59 publications

(36 citation statements)

References 20 publications

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“…The airflow patterns in a fruit orchard induced by external winds and drag effect of tree canopies were validated well by Hong et al [14,16]. In these studies, air velocity distributions inside and around tree canopies were predicted by CFD simulations integrated with the source terms introduced in Section 2.2 and showed a relative error of 29.2% when the simulation results were compared to field measurements.…”

Section: Validity Of the Developed Modelmentioning

confidence: 60%

“…These source terms were calculated only for the grid cells located within the trees. This modelling method and the details of the source terms for momentum loss and turbulence generation due to tree canopies are described well by Hong et al [14,16]. The CFD simulations were performed using ANSYS Fluent CFD code (version 18.2, Ansys, Inc., Canonsburg, PA, USA).…”

Section: Orchard Parameters and Computational Domainmentioning

confidence: 99%

“…Here the pressure loss coefficient C ir is inversely proportional to the density of the tree canopy; c g is the specific grid cell for which the source term is calculated; and C g,tree is the group of grid cells located within trees [14].…”

Section: Cfd For Canopy Air Flowsmentioning

confidence: 99%

“…Considering the high variations of crop characteristics in field conditions, the simulation results were quite reasonable. All details regarding the simulations of airflow patterns can be found in Hong et al [14]. The same CFD models were also used for SAAS, a computer program for estimating pesticide spray drift from orchards [23].…”

Section: Validity Of the Developed Modelmentioning

confidence: 99%

“…The third stream of works (and the most related) in the literature considered air flow around and through trees [12][13][14]. For example, Hong et al [14] investigated airflow inside tree canopies discharged from air-assisted sprayers through a sophisticated CFD modelling.…”

Section: Introductionmentioning

confidence: 99%

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Thermofluid Modelling of Large-Scale Orchards for Optimal Design and Control of Active Frost Prevention Systems

2020

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Accurate modelling and simulation of temperature dynamics in large-scale orchards is important in many aspects, including: (i) for the calculation of minimum energy required to be used in optimal design of active frost prevention energy systems (fully renewable or partially renewable) to prevent freezing of fruit flowers, buds, or leaves; (ii) for testing frost prevention control systems before real-implementation which regulate active heating systems inside orchards targeted to prevent frost. To that end, in this study, first, a novel and sophisticated parametric computational thermofluid dynamics (CTFD) model for orchard air thermal dynamics for different orchard parameters (such as fruit type, climate, number of trees, their sizes, and distance between them) and boundary/initial conditions was developed and validated with field data from the literature. Next, the use of the developed parametric CTFD model was demonstrated through a case study to calculate the minimal thermal energy required to prevent frost under different frost levels in a test Prunus armeniaca orchard located in Malatya, Turkey, which is the world capital for dry apricot production.

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Section: Validity Of the Developed Modelmentioning

confidence: 60%

Section: Orchard Parameters and Computational Domainmentioning

confidence: 99%

Section: Cfd For Canopy Air Flowsmentioning

confidence: 99%

Section: Validity Of the Developed Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermofluid Modelling of Large-Scale Orchards for Optimal Design and Control of Active Frost Prevention Systems

2020

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Wind field and droplet coverage characteristics of air‐assisted sprayer in mango‐tree canopies

Jiang

Yang

et al. 2022

Pest Management Science

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BACKGROUND Air‐assisted sprayers is one of the primary fruit tree pest control approaches in agricultural production. It is necessary to study the influence of multiple factors on both wind field and droplet coverage of air‐assisted sprayers. In this article, foliage area volume density (FAVD) and power gradient were considered factors, and field tests were conducted in an orchard to determine such influence. RESULTS The results showed that in‐canopy wind speed was mainly affected by the air‐assisted sprayer. FAVD showed significance to the wind speed and droplet coverage inside canopies (P < 0.001), compared with power gradient (P > 0.05). With the increase of FAVD, the wind speed in the bottom layer of canopies first increased and then decreased, while the wind speed in the middle and top layers first decreased and then increased. Meanwhile, the wind field was mainly concentrated on the surface of canopies and gradually approached the canopy center as the power gradient increased. Furthermore, a Back‐Propagation (BP) neural network prediction model was constructed to predict droplet coverage at any canopy location to avoid repeated experiments. The overall correlation coefficient (R) of this model was about 0.731, indicating good fitting performance. CONCLUSION FAVD has a significant effect on wind speed and droplet deposition inside the canopy, and the air‐assisted sprayer parameter setting should consider the effect of FAVD. The prediction model can predict droplet deposition inside the canopy without repeating. The study can provide a reference for selecting operating parameters of air‐assisted sprayers and help reduce droplet loss and environmental pollution. © 2022 Society of Chemical Industry.

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Simulation and Experimental Study of Static Porosity Droplets Deposition Test Rig

Song

Liu²,

Liu³

et al. 2020

Lecture Notes in Electrical Engineering

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CFD simulation of airflow inside tree canopies discharged from air-assisted sprayers

Cited by 59 publications

References 20 publications

Thermofluid Modelling of Large-Scale Orchards for Optimal Design and Control of Active Frost Prevention Systems

Thermofluid Modelling of Large-Scale Orchards for Optimal Design and Control of Active Frost Prevention Systems

Wind field and droplet coverage characteristics of air‐assisted sprayer in mango‐tree canopies

Simulation and Experimental Study of Static Porosity Droplets Deposition Test Rig

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