A computational model for calculating temperature distributions in microwave food applications

Knoerzer, Kai; Regier, Marc; Schubert, Helmar

doi:10.1016/j.ifset.2007.10.007

Cited by 67 publications

(27 citation statements)

References 15 publications

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“…Furthermore, contrary to some commonly held belief, previous modelling results and experimental study all confirmed that the temperature was not uniformly distributed in the microwave cured samples (Makul et al, 2010;Knoerzer et al, 2008). Nonetheless, based on the previous research on curing PC-based products, it can be clearly seen that microwave curing can greatly reduce the curing duration.…”

Section: Introductionmentioning

confidence: 65%

Comparative Study of Alkali-Activated Fly Ash Manufactured Under Pulsed Microwave Curing and Thermal Oven Curing

Shi¹,

Bai²,

Li³

et al. 2014

Proceedings of the 4th International Conference on the Durability of Concrete Structures

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This paper compares the alkali-activated fly ash (AAFA) manufactured with thermal oven curing and pulsed microwave curing methods. Fly ash activated by 8M NaOH solution at a liquid to solid ratio of 0.3 was cured by thermal oven at 85°C and domestic microwave oven, respectively. Apart from compressive strength test, the temperature profiles of AAFA samples were captured by thermal camera. Reaction products of AAFA were characterised with XRD, FTIR and TG/DTG, while the microstructure of AAFA was analysed by MIP and SEM. The results showed that with much shorter curing duration, the compressive strength of AAFA samples under microwave curing was comparable to those samples under thermal oven curing. The XRD results demonstrated that different reaction products were generated from thermal oven curing (hydroxysodalite) and microwave curing (chabazite-Na) respectively. The FTIR spectra showed that aluminosilicate with higher degree of polymerization was formed in the sample with microwave curing. MIP indicated equivalent total porosities from both curing methods, while a well-distributed matrix phase under thermal oven curing were found in the SEM results. Overall, the results demonstrate that microwave curing has great potential to be an alternative curing method for manufacturing AAFA.

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Section: Introductionmentioning

confidence: 65%

Comparative Study of Alkali-Activated Fly Ash Manufactured Under Pulsed Microwave Curing and Thermal Oven Curing

Shi¹,

Bai²,

Li³

et al. 2014

Proceedings of the 4th International Conference on the Durability of Concrete Structures

View full text Add to dashboard Cite

show abstract

“…The effect of R groups was examined in the case of two anions-BF 4 (compounds 1-4) and PF 6 (compounds 5-8) at 3-5 watts of microwave energy.…”

Section: Results and Obtained Characteristicsmentioning

confidence: 99%

“…During the microwave treatment, temperature of the sample continuously rises and its dielectric properties also change [6]. From the generator's viewpoint, the value of terminating impedance represented by the transmission line changes accordingly.…”

Section: Materials In Electromagnetic Fieldmentioning

confidence: 99%

Dielectric Characteristics of Ionic Liquids and Usage in Advanced Energy Storage Cells

Göllei¹

2017

Progress and Developments in Ionic Liquids

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Before the application of ionic liquids, it is important to know their fundamental physical and chemical properties. Practical experience has shown that it is important to look at these materials in the behaviour of the function frequency and temperature. To understand obtained information understanding the molecular-physic bases is needed. Research and application of ionic liquids have attracted an increasing attention in the areas of nuclear industry, oil and gas industry, petrochemical industry, chemical and electrochemical industry. The number of studies dealing with the question is proliferating which opens up new horizons in the field of chemical operations in microwave field with ionic liquids (organic chemical synthesis, catalytic operations, etc.). As a result of the relatively high destroying temperature of ionic liquids, a wider temperature range of operations can be done and it offers environmental friendly solution in the replacement of the toxic solvents with generally low evaporating temperatures. The area of application is becoming more widespread as electrolyte of novel battery cells. Being aware of the physical and chemical properties of ionic liquids is necessary in order to apply them. The main goal of this research was to test the dielectric properties, viscosity and temperature dependence of the electrical conductivity. Based on our results, we can claim that significant temperature dependence of the three properties can be shown in the case of ionic liquids. These findings are crucial for the usability of applications, planning and preparing of production and optimization processes. The significance and importance of these results become even more obvious if we consider the fact that these energy storage cells are exposed to large temperature differences. The present study discusses the

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“…At this stage, the requirement for a hot air assisted system to prevent loss of heat from the microwave treated apples was recognised. The use of hot air to obtain better temperature uniformity for microwave heated products was reported by Ikediala, Tang, Neven, and Drake (1999) and Knoerzer et al (2008).…”

Section: Development Of Mw Treatmentmentioning

confidence: 99%

“…Electromagnetic waves penetrate the fruit and the energy is internally dissipated into thermal energy volumetrically heating the fruit. Whilst even heating of the whole fruit is theoretically possible, non-uniform electric fields in microwave cavities, heterogeneous product structure, varying thermal and dielectric properties of the fruit components, among other microwave inherent factors, often cause uneven heating during the treatment process Knoerzer, Regier, & Schubert, 2008).…”

Section: Introductionmentioning

confidence: 99%

Continuous combined microwave and hot air treatment of apples for fruit fly (Bactrocera tryoni and B. jarvisi) disinfestation

Gamage

Sanguansri

Swiergon

et al. 2015

Innovative Food Science & Emerging Technologies

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A computational model for calculating temperature distributions in microwave food applications

Cited by 67 publications

References 15 publications

Comparative Study of Alkali-Activated Fly Ash Manufactured Under Pulsed Microwave Curing and Thermal Oven Curing

Comparative Study of Alkali-Activated Fly Ash Manufactured Under Pulsed Microwave Curing and Thermal Oven Curing

Dielectric Characteristics of Ionic Liquids and Usage in Advanced Energy Storage Cells

Continuous combined microwave and hot air treatment of apples for fruit fly (Bactrocera tryoni and B. jarvisi) disinfestation

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