Rapidly removing field heat after harvest is a key step in food cold chain logistics to ensure the good quality of fruits and vegetables and consequently extend their storage and shelf life. The internal structure of package filled with trays and products is complex, resulting in serious cooling heterogeneity. The present study focuses on the effect of tray design on the precooling process of apples and attempts to give the optimal gap width between tray and box wall. The widely-used corrugated double-layered apple packaging box in the market was chosen as the research object, a three-dimensional model was established, and the precooling process of apples was studied by using the direct computational fluid dynamics (CFD) simulation method. Results indicate that increasing the gap width is an effective way to shorten the precooling time and improve the precooling uniformity. However, the gap width can not be increased infinitely. Therefore, considering the influence of the gap width increment on both the precooling time and the uniformity of apple temperature, the optimal gap width increment between the tray and the box wall should be 7.5 mm. This results in shorter precooling time and better precooling uniformity.
[1] 王文生,杨少桧,闫师杰.我国果蔬冷链发展现状与节能降耗主要途径[J].保鲜与加工,2016,16(2):1-5.
[2] Wu W, Defraeye T. Identifying heterogeneities in cooling and quality evolution for a pallet of packed fresh fruit by using virtual cold chains[J]. Applied Thermal Engineering, 2018, 133:407-417.
[3] Vigneault C, Goyette B. Design of plastic container opening to optimize forced-air precooling of fruits and vegetables[J]. Applied Engineering in Agriculture, 2002, 18(1):73-76.
[4] Delele M A, Verboven P, Ho Q T, et al. Advances in mathematical modelling of postharvest refrigeration processes[J]. Stewart Postharvest Review, 2010, 2(1):1-8.
[5] Delele M A, Ngcobo M E K, Getahun S T, et al. Studying airflow and heat transfer characteristics of a horticultural produce packaging system using a 3-D CFD model. Part I:Model development and validation[J]. Postharvest Biology and Technology, 2013, 86:536-545.
[6] Delele M A, Ngcobo M E K, Getahun S T, et al. Studying airflow and heat transfer characteristics of a horticultural produce packaging system using a 3-D CFD model. Part Ⅱ:Effect of package design[J]. Postharvest Biology and Technology, 2013, 86:546-555.
[7] Han J W, Qian J P, Zhao C J, et al. Mathematical modelling of cooling efficiency of ventilated packaging:integral performance evaluation[J]. International Journal of Heat and Mass Transfer, 2017, 111:386-397.
[8] Han J W, Zhao C J, Yang X T, et al. Computational modeling of airflow and heat transfer in a vented box during cooling:optimal package design[J]. Applied Thermal Engineering, 2015, 91:883-893.
[9] Zhao C J, Han J W, Yang X T, et al. A review of computational fluid dynamics for forced-air cooling process[J]. Applied Energy, 2016, 168:314-331.
[10] Dehghannya J, Ngadi M, Vigneault C. Mathematical modeling procedures for airflow, heat and mass transfer during forced convection cooling of produce:a review[J]. Food Engineering Reviews, 2010, 2(4):227-243.
[11] Verboven P, Tijskens E, Ramon H, et al. Virtual filing and airflow simulation of boxes with horticultural products[J]. Acta Horticulturae, 2005, 687:47-54.
[12] 韩佳伟. 多层级苹果预冷过程模拟及预冷控制决策优化[D]. 北京:北京工业大学,2018.
[13] de Castro L R, Vigneault C, Cortez L A B. Cooling performance of horticultural produce in containers with peripheral openings[J]. Postharvest Biology and Technology, 2005, 38(3):254-261.
[14] Delele M A, Tijskens E, Atalay Y T, et al. Combined discrete element and CFD modelling of airflow through random stacking of horticultural products in vented boxes[J]. Journal of food engineering, 2008, 89(1):33-41.
[15] Defraeye T, Lambrecht R, Delele M A, et al. Forced-convective cooling of citrus fruit:cooling conditions and energy consumption in relation to package design[J]. Journal of food engineering, 2014, 121:118-127.
[16] Wang D, Lai Y, Zhao H, et al. Numerical and experimental investigation on forced-air cooling of commercial packaged strawberries[J]. International Journal of Food Engineering, 2019, 15(7):831-838.
[17] Pathare P B, Opara U L, Vigneault C, et al. Design of packaging vents for cooling fresh horticultural produce[J]. Food and Bioprocess Technology, 2012, 5(6):2031-2045.
[18] Dehghannya J, Ngadi M, Vigneault C. Transport phenomena modelling during produce cooling for optimal package design:thermal sensitivity analysis[J]. Biosystems Engineering, 2012, 111(3):315-324.
[19] Berry T M, Defraeye T, Nicolaï B M, et al. Multiparameter analysis of cooling efficiency of ventilated fruit cartons using CFD:impact of vent hole design and internal packaging[J]. Food and Bioprocess Technology, 2016, 9(9):1481-1493.
[20] 陈秀勤,卢立新,王军.包装箱内层装果品差压预冷温度场的数值模拟与验证[J].农业工程学报,2014,30(12):249-257.
[21] Opara L U, Zou Q. Sensitivity analysis of a CFD modelling system for airflow and heat transfer of fresh food packaging:inlet airflow velocity and inside-package configurations[J]. International Journal of Food Engineering, 2007, 3(5):1556-1571.
[22] Gruyters W, Defraeye T, Verboven P, et al. Reusable boxes for a beneficial apple cold chain:a precooling analysis[J]. International Journal of Refrigeration, 2019, 106:338-349.
[23] Tanner D J, Cleland A C, Robertson T R. A generalised mathematical modelling methodology for design of horticultural food packages exposed to refrigerated conditions:Part 3, mass transfer modelling and testing[J]. International Journal of Refrigeration, 2002, 25(1):54-65.
[24] O'Sullivan J, Ferrua M J, Love R, et al. Modelling the forced-air cooling mechanisms and performance of polylined horticultural produce[J]. Postharvest Biology and Technology, 2016, 120:23-35.
[25] Berry T M, Fadiji T S, Defraeye T, et al. The role of horticultural carton vent hole design on cooling efficiency and compression strength:a multi-parameter approach[J]. Postharvest Biology and Technology, 2017, 124:62-74.
[26] 王达,贾斌广,杨相政,等.苹果双向交替送风压差预冷的数值模拟[J].食品科技,2019,44(2):40-45.
