Food and Fermentation Industries >

2025 , Vol. 51 >Issue 3: 225 - 233

DOI: https://doi.org/10.13995/j.cnki.11-1802/ts.038165

Effect of vacuum pre-cooling on compressive mechanical properties of fresh wolfberry and finite element simulation

  • ZHOU Lianghuan ,
  • KANG Ningbo ,
  • ZHANG Hongbo ,
  • QU Qianjin ,
  • ZHANG Jun
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  • (School of Food Science and Engineering, Ningxia University, Yinchuan 750021, China)

Received date: 2023-12-05

  Revised date: 2024-03-25

  Online published: 2025-02-21

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Abstract

Vacuum pre-cooling technology can effectively eliminate the field heat and respiratory heat of fresh wolfberry after picking.However, the damage mechanism of fresh wolfberry induced by vacuum pre-cooling pressure is not clear.In order to deeply investigate the effect of vacuum pressure on the mechanical properties of fresh wolfberry, this paper explores and simulates the mechanical behavior of fresh wolfberry under different vacuum pre-cooling final pressures.Different vacuum pre-cooling final pressure conditions (500-800, 800-1 100, 1 100-1 400 Pa) were set up, and the fresh wolfberry was compressed longitudinally and transversely by using a mass spectrometer, and the stress-strain curves were linearly fitted to obtain the rupture force, modulus of elasticity, rupture energy, and stiffness of the fresh wolfberry during compression rupture, and the transverse compression of the four groups of samples was subjected to finite element simulation, and a finite element model.The results showed that the final pressure of vacuum pre-cooling had a significant effect on the mechanical properties of fresh wolfberry.Compared with the longitudinal compression and transverse compression of the blank control group, the modulus of elasticity of fresh wolfberry in the other three groups under different pre-cooling final compression conditions decreased.Among which the decrease was the smallest in the group of 800-1 100 Pa in transverse compression, and the decrease was the smallest in the group of 1 100-1 400 Pa in longitudinal compression.After finite element simulation, it was found that the stress-strain at the stress position and equatorial plane was the largest and spread outward along the equatorial plane.The errors between simulated and experimental values for all four groups of simulation tests were within 20%.This study will provide theoretical guidance for the upgrading of pre-cooling and preservation technology and equipment.

Key words： fresh wolfberry; vacuum pre-cooling; compression; mechanical properties; physical parameters

Cite this article

ZHOU Lianghuan , KANG Ningbo , ZHANG Hongbo , QU Qianjin , ZHANG Jun . Effect of vacuum pre-cooling on compressive mechanical properties of fresh wolfberry and finite element simulation[J]. Food and Fermentation Industries, 2025 , 51(3) : 225 -233 . DOI: 10.13995/j.cnki.11-1802/ts.038165

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