scholarly journals CFD Modelling of the Thermal Performance of Fruit Packaging Boxes—Influence of Vent-Holes Design

Energies ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7990
Author(s):  
Adhiyaman Ilangovan ◽  
João Curto ◽  
Pedro D. Gaspar ◽  
Pedro D. Silva ◽  
Nanci Alves
Keyword(s):  
Shelf Life ◽  
Thermal Performance ◽  
Cold Storage ◽  
Three Dimensional ◽  
Life Extension ◽  
Perishable Products ◽  
Cfd Modelling ◽  
Computational Fluid Dynamics Cfd ◽  
Short Time ◽  
Model Temperature

The shelf life of perishable products depends mainly on the conservation of air temperature. Packaging boxes are usually used to accommodate food products during cold storage and transport and/or display. The design of the vent-holes of the packaging box must promote cold airflow and remove the field heat of the produce after harvest at a short time. This study describes the influence of the vent-holes design and its performance during cold storage. The cooling performance of the different packaging boxes is evaluated experimentally and numerically using Computational Fluid Dynamics (CFD). Three new packaging box configurations with the same size but different vent-holes design (size, shape and position) and a reference box are modelled. The transient three-dimensional CFD model predicts the airflow pattern and temperature distribution within the different packaging boxes. The best thermal performance packaging achieved a fruit model temperature 1.5 K to 5 K lower than the other configurations at the end of 8 h of cooling. These predictions allow the development of new packaging box designs that promote the shelf-life extension of perishable products.

scholarly journals A Methodology for Modelling of Steady State Flow in Pelton Turbine Injectors

2019 ◽  
Vol 15 (2) ◽  
pp. 246-255
Author(s):  
Tri Ratna Bajracharya ◽  
Rajendra Shrestha ◽  
Ashesh Babu Timilsina
Keyword(s):  
Velocity Profile ◽  
High Speed ◽  
Three Dimensional ◽  
Maximum Error ◽  
Cfd Modelling ◽  
Pelton Turbine ◽  
Short Period ◽  
Computational Fluid Dynamics Cfd ◽  
Jet Velocity ◽  
Nozzle Opening

 Pelton turbine is a high head-impulse type turbine. The high-speed jet strikes the symmetrical semi ellipsoidal buckets, thus transferring the momentum within short period of time, impulse. The conversion of potential energy of water to kinetic energy in the form of jet is done by a nozzle with internally fitted spear or needle, the assembly in known as injector. The jet quality includes but is not limited to jet velocity, velocity distribution ‘velocity profile’, core location etc. In this study, the modeling of flow in Pelton turbine injector is done by commercial Computational Fluid Dynamics (CFD) solver on a three-dimensional flow domain. The results obtained from CFD modelling are then compared against the experimental observations and previously published literatures. The jet streamline, jet velocity profile and jet core location are then studied. As observed experimentally, the mean jet diameter reduces as the nozzle opening decreases. In addition, like the experimental observations, the jet first contracts and then expands. The diameter of the contraction is then normalized with nozzle exit diameter and is plotted for both experimental observations as well as the results of the numerical simulation. The maximum error between experimental and numerical analysis of jet contraction is 20%. The jet core is located at region axially ahead of needle tip.

scholarly journals Use of Cuminum Cyminum Essential Oil and Biarum carduchcorum Water Extract on Shelf-life Extension of lambs at Cold Storage

2019 ◽  
Vol 6 (3) ◽  
pp. 23-32
Author(s):  
Vaez Nemati ◽  
Morteza Khomeiri ◽  
Ali Moayedi ◽  
Alireza Sadeghi Mahoonak ◽  
Alireza Sadeghi ◽  
...  
Keyword(s):  
Essential Oil ◽  
Shelf Life ◽  
Cold Storage ◽  
Water Extract ◽  
Life Extension ◽  
Cuminum Cyminum ◽  
Shelf Life Extension

Numerical modelling of spray sheet deflection on planing hulls

2016 ◽  
Vol 231 (4) ◽  
pp. 811-817 ◽  
Author(s):  
Linus Olin ◽  
Mireia Altimira ◽  
Jonas Danielsson ◽  
Anders Rosén
Keyword(s):  
Three Dimensional ◽  
Two Dimensional ◽  
Cfd Modelling ◽  
Cfd Simulations ◽  
Total Drag ◽  
Spray Formation ◽  
Computational Fluid Dynamics Cfd ◽  
Spray Field ◽  
Wedge Impact ◽  
Design Factors

This paper considers the modelling of spray formation on planing hulls. The focus is on assessing the applicability of the prevailing theories and two-dimensional and three-dimensional Computational Fluid Dynamics (CFD) simulations in the investigation of different design factors for a novel spray deflection concept. The spray deflection concept is presented and its performance is evaluated by comparison with traditional spray rails. It is found that the prevailing theory where the spray field of a planing hull is represented by a two-dimensional flat planing plate will overestimate the spray thickness, whereas the theories that are based on wedge impact are correlating well with the results from the CFD simulations. Compared to a bare hull, adding spray deflectors reduces the viscous resistance by 28% for the studied cases. The spray deflectors further redirect the spray aftwards which reduce the total drag an additional 4%. The paper also discusses various aspects on CFD modelling of spray formation.

SHELF LIFE EXTENSION OF RAMBUTAN BY MINIMAL PROCESSING, MODIFIED ATMOSPHERE PACKAGING AND COLD STORAGE

2008 ◽  
pp. 535-540 ◽  
Author(s):  
A. Sirichote ◽  
S. Chanthachum ◽  
S. Pisuchpen ◽  
B. Jongpanyalert ◽  
L. Srisuwan ◽  
...  
Keyword(s):  
Shelf Life ◽  
Cold Storage ◽  
Modified Atmosphere Packaging ◽  
Life Extension ◽  
Modified Atmosphere ◽  
Minimal Processing ◽  
Shelf Life Extension
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