International Scientific Journal

Authors of this Paper

External Links


The distribution of velocity and temperature field inside the granary can be used to evaluate ventilation quality. A well-ventilated system with uniform air-flow and cooling can effectively prevent moisture accumulation. To address the issue of poor uniformity in ventilation and cooling, this research introduces two new ventilation systems: the non-fractal ventilation system and the fractal ventilation system. The fractal structure was designed based on optimized parameters obtained from rectangular elements with minimum flow resistance. Numerical simulation methods were employed to verify the effectiveness of these ventilation systems. A comparative analysis was conducted, examining the velocity field, temperature field, and velocity uniformity of the two systems. The results demonstrated that the presence of a sand packing zone helped the grain pile zone avoid most of the areas with poor ventilation. The discontinuous pores at the interface between the sand packing zone and the grain pile zone significantly increased flow resistance, effectively reducing the velocity of high speed ventilation into the grain pile zone and decreasing the permeability of the grain pile zone towards the poorly ventilated areas of the sand pile zone. Furthermore, the fractal structure greatly enhanced ventilation intensity in areas with poor ventilation in the velocity field, while also improving the uniformity of cooling in the temperature field. This research presents an innovative solution for ventilation in room-type warehouses, offering a new option for effective and efficient ventilation.
PAPER REVISED: 2023-09-20
PAPER ACCEPTED: 2023-09-30
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2024, VOLUME 28, ISSUE Issue 2, PAGES [1545 - 1559]
  1. Gao, L., Characteristics and Reduction of Potentials of Loss and waste of Major Grains of the Food Supply Chain in China, Chinese Academy of Agricultural Sciences (in Chinese), Ph. D. thesis, Beijing, China, 2019
  2. Cui, J., Population Ecology of Major Stored Product Insect Pests in Large Warehouse (in Chinese), M. Sc. thesis, South Western University of Finance and Economics, Chongqing, China, 2006
  3. Thorpe, G. R., On the Rate of Cooling of Aerated Food Grains, Biosystems Engineering, 222 (2022), Oct., pp. 106-116
  4. Liu, S, Wu, Z., Granary Ventilation Systems and Methods (in Chinese), Chinese Patent: 201510608233.4, 2017-03-29
  5. Li, J., et al., Simulation Study on the Ventilation Effect of a New Type of Ventilation Network on Room- Type Warehouses (in Chinese), Science and Tech. of Cereals, Oils and Foods, 31 (2023), 1, pp. 189-195
  6. Xiong, D., Dewdew Formation in Grain Piles with Mechanical Ventilation and Its Prevention (in Chinese), Food Science and Technology and Economy, (1999), 4, pp. 25-27
  7. ***, Code for Design of Grain Bungalows, Beijing China Planning Publishing House (in Chinese),
  8. Thorpe, G. R., The Application of Computational Fluid Dynamics Codes to Simulate Heat and Moisture Transfer in Stored Grains, Journal of Stored Products Research, 44 (2008), 1, pp. 21-31
  9. Thorpe, G. R., The Modelling and Potential Applications of a Simple Solar Regenerated Grain Cooling Device, Postharvest Biology and Technology, 13 (1998), 2, pp. 151-168
  10. de Carvalho Lopes, D., et al., Aeration Simulation of Stored Grain Under Variable Air Ambient Conditions, Postharvest Biology and Technology, 42 (2006), 1, pp. 115-120
  11. Gbenga, O., et al., CFD Modeling of Air Flow Distribution in Rice Bin Storage System with Different Grain Mass Configurations, Biosystems Engineering, 151 (2016), Nov., pp. 286-297
  12. Zhang, X., et al., Research on the Temperature Field of Grain Piles in Underground Grain Silos Lined with Plastic, Journal of Food Process Engineering, 45 (2022), 3, e13971
  13. Salameh, T., et al., Analysis of Cooling Load on Commercial Building in UAE Climate Using Building Integrated Photovoltaic Façade System, Solar Energy, 199 (2020), Mar., pp. 617-629
  14. Chen, L., et al., Constructal Entransy Dissipation Rate Minimization for Mass Transfer Based on Rectangular Element with Constant Channel, J. of Thermal Science and Technology, 11 (2012), 2, pp. 136-141
  15. Bejan, A., Errera, M. R., Deterministic Tree Networks for Fluid Flow: Geometry for Minimal Flow Resistance Between a Volume and One Point, Fractals-london-, 5 (1997), 4, pp. 685-696
  16. Feng, H., et al., "Volume-Point" Mass Transfer Constructal Optimization Based on Triangular Element, Arabian Journal for Science and Engineering, 38 (2013), 2, pp. 365-372
  17. Bejan, A., Constructal Theory: From Thermodynamic and Geometric Optimization to Predicting Shape in Nature, Energy Conversion and Management, 39 (1998), 16, pp. 1705-1718
  18. Liu, H., Comby Fractal Microchannel Network for Fluid Flow in Porous Media (in Chinese), M. Sc. thesis, Huazhong University of Science and Technology, Wuhan, China, 2014
  19. Wang, Y., et al.,Modeling on Heat and Mass Transfer in Stored Wheat During Forced Cooling Ventilation, Journal of Thermal Science, 19 (2010), 2, pp. 167-172
  20. Bejan, A., Constructal Tree Network for Fluid Flow Between a Finite-Size Volume and One Source or Sink, Revue Générale De Thermique, 36 (1997), 8, pp. 592-604
  21. Errera, M. R, Bejan, A., Tree Networks for Flows in Composite Porous Media, Journal of Porous Media, 2 (1999), 1, pp. 1-17
  22. Wang, Z., Numerical Simulation and Experimental Study on Heat and Mass Transfer of Stored Grain Pile (in Chinese), Ph. D. thesis, China Agricultural University, Beijing, China, 2014
  23. Weltens, H., et al., Optimisation of Catalytic Converter Gas Flow Distribution by CFD Prediction, International Congress & Exposition, SAE Technical Paper 930780, 1993

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence