Diffusion analysis of carbon dioxide released by egg respiration at different storage temperatures based on FLUENT

Abstract

Temperature is an important factor affecting the changes in the amount of gas exchanged between eggs and the surrounding during storage. The effect of temperature changes on the release of carbon dioxide (CO2) from eggs was studied using eggs from the same breed. The experimental samples were divided into three groups, and placed in a storage box at 4, 25, or 35°C with 65% relative humidity for 20 days, and a breathalyser was used to measure the amount of CO2 released by the eggs. The FLUENT software was used to simulate the diffusion at different temperatures. The conclusion from the present work was that as the temperature decreased, the amount and speed of CO2 released by the eggs also decreased. The simulation results show that the diffusion of CO2 released by egg respiration can be divided into the following sequential stages: initial, descending, mixing, and turbulence. When the storage temperature was 4°C, the CO2 cloud of eggs was the lowest, followed by 35°C, and finally 25°C. The results show that the direction of gas diffusion was mainly affected by temperature, diffusion volume, and diffusion velocity, and that temperature mainly affected vertical gas diffusion. The present work thus provides a theoretical basis for egg respiration related research.

CFD Analysis on the Diffusion and Accumulation Characteristics of Microleakage LPG in an Integrated Stove

“…demonstrated that the standard k -epsilon model performed better in simulations of heavy gas diffusion, and the simulation results were validated by experimental results. The diffusion process of the gas was modeled by Fluent’s species transport model . Due to the lack of LPG-related parameters in the Fluent gas database, and the fact that LPG consists primarily of propane and butane gas as its main components, Liang et al used a mixture of 47% propane and 53% butane instead of LPG.…”

“…The diffusion process of the gas was modeled by Fluent’s species transport model. 35 Due to the lack of LPG-related parameters in the Fluent gas database, and the fact that LPG consists primarily of propane and butane gas as its main components, Liang et al 36 used a mixture of 47% propane and 53% butane instead of LPG. We compared the physical characteristics (gaseous density, molecular weight, and explosion limit) and transport properties (kinematic viscosity, thermal conductivity, and diffusion coefficient) of both gases and LPG (as shown in Table 1 ), and it should be noted that the light hydrocarbon components of LPG improve its diffusion coefficient.…”