Dielectric characterization of rapeseed (Brassica napus L.) from 10 to 3000 MHz

Bansal, Namita; Dhaliwal, A.S.; Mann, Kuldip Singh

doi:10.1016/j.biosystemseng.2015.12.014

Cited by 23 publications

(15 citation statements)

References 35 publications

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“…When the moisture content was between 15.1% and 29.5%, d p decreased with increasing temperature firstly, then changed small or even kept constant. Similar results have been reported for mango puree 49 , chestnut 50 , and rapeseed 51 . When the moisture content was higher than and equal to 34.1% w.b., d p increased slightly and linearly with increasing temperature.…”

Section: Resultssupporting

confidence: 89%

Frequency, moisture content, and temperature dependent dielectric properties of potato starch related to drying with radio-frequency/microwave energy

Zhu

Guo

2017

Sci Rep

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To develop advanced drying methods using radio-frequency (RF) or microwave (MW) energy, dielectric properties of potato starch were determined using an open-ended coaxial-line probe and network analyzer at frequencies between 20 and 4,500 MHz, moisture contents between 15.1% and 43.1% wet basis (w.b.), and temperatures between 25 and 75 °C. The results showed that both dielectric constant (ε′) and loss factor (ε″) were dependent on frequency, moisture content, and temperature. ε′ decreased with increasing frequency at a given moisture content or temperature. At low moisture contents (≤25.4% w.b.) or low temperatures (≤45 °C), ε″ increased with increasing frequency. However, ε″ changed from decrease to increase with increasing frequency at high moisture contents or temperatures. At low temperatures (25–35 °C), both ε′ and ε″ increased with increasing moisture content. At low moisture contents (15.1–19.5% w.b.), they increased with increasing temperature. The change trends of ε′ and ε″ were different and dependent on temperature and moisture content at their high levels. The penetration depth (d p) decreased with increasing frequency. RF treatments may provide potential large-scale industrial drying application for potato starch. This research offers useful information on dielectric properties of potato starch related to drying with electromagnetic energy.

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Section: Resultssupporting

confidence: 89%

Frequency, moisture content, and temperature dependent dielectric properties of potato starch related to drying with radio-frequency/microwave energy

Zhu

Guo

2017

Sci Rep

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“…In comparison to Equation (6) ( Table 5), the force coefficient A values ranged from 2.931 ± 0.061 to 2.128 ± 0.284, 6.434 ± 0.246 to 3.738 ± 0.168 and 12.280 ± 1.442 to 8.431 ± 1.660 kN. For the deformation coefficient, similar amounts as indicated above for Equation (5) were observed. From the determined coefficients, it was observed that Equation (5) showed high suitability for fitting the linear compression data compared to Equation (6) with respect to the higher coefficient of determination values.…”

Section: Resultssupporting

confidence: 73%

“…There is the concern with the environmental preservation, which is structured both in efforts to optimize energy efficiency and investments in research, development and application of renewable resources, and cleaner technologies [1][2][3][4]. Vegetable oil from oilseeds such as sunflower seeds, rapeseeds among others is one of the renewable sources worldwide for application in internal combustion engines [5,6]. However, the design of efficient oil expression systems for industry and small-scale or rural-based operations has been the main challenge to engineers and scientists [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Equation (4) describes the theoretical deformation energy of the bulk sample at a specific pressing height where the force is a function of the deformation. Equation (5) and Equation (6) explain the integral of Equation (4) for which n = 1 and n = 2 respectively. For describing the theoretical deformation energy of the bulk sample where the force is a function of different variables such as deformation, pressing height and vessel diameter [32,34], Equation (7) was applied.…”

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confidence: 99%

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Modeling of Linear and Non-linear Compression Processes of Sunflower Bulk Oilseeds

et al. 2019

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The present study aimed at describing the experimental and theoretical force-deformation curves of sunflower bulk oilseeds at varying initial pressing heights and vessel diameters as well as determining the theoretical pressure and energy along the screw press FL 200 pressing chambers. The design of efficient oil expression systems for industry and small-scale application remains a major challenge to engineers and researchers. In attempting to solve the problem, it is important to understand the linear compression process and to transfer the knowledge to the industry involving mechanical screw presses. The universal compression testing machine at a preset load of 200 kN and a speed of 5 mm·min −1 , tangent curve model and the screw press FL 200 geometry parameters were applied. The obtained results of pressure and energy along the screw pressing chambers (1-7) ranged from 0.31 to 101.653 MPa and 12.616 to 1231.228 J. Applying the tangent model at n = 1 and n = 2, the cumulative pressure decreased with increasing vessel diameters while energy increased. The study provides useful information for the analysis of other bulk oilseeds and optimizing the processing parameters of screw press FL 200 and the design and development of new oil presses. 116 geometry (m 2 ). The theoretical pressure and energy at the screw lamella positions (from 0-7) were 117 determined using Equations (8)-(11). Both the experimental and theoretical data were statistically 118 analyzed using MathCAD software, version 15 and STATISITCA, version 13 [41,42].

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“…Low molecular mass glassy solids and liquids like phenyl-salicylate, maltitol and glycerol were investigated by TSD [2], and relaxation processes were resolved by thermal sampling method. Rapeseed oil was tested by AC dielectric method [3] from 10 MHz to 3 GHZ. Even 10 Hz is 4 to 5 orders of magnitude higher frequency than the effective frequency of TSD.…”

Section: Introductionmentioning

confidence: 99%

Combined thermal analysis of fluid plasticizers

Ihemaguba

Marossy

2020

J Therm Anal Calorim

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The paper deals with the study of plasticizers using different thermal methods. The literature data on the melting points of plasticizers proved uncertain; we intended to gather the data by other methods, differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA) and thermally stimulated discharge (TSD). Results of ten plasticizers are demonstrated. During this work, we found that most of plasticizers have no well-defined melting point, and the solidification of plasticizer is similar to the glass transition of polymers. Only the di-n-butyl-phthalate showed regular crystallization. Thermally stimulated discharge current (TSD) method revealed that these compounds have several transitions –dispersion ranges assigned to different molecular motions.

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Dielectric characterization of rapeseed (Brassica napus L.) from 10 to 3000 MHz

Cited by 23 publications

References 35 publications

Frequency, moisture content, and temperature dependent dielectric properties of potato starch related to drying with radio-frequency/microwave energy

Frequency, moisture content, and temperature dependent dielectric properties of potato starch related to drying with radio-frequency/microwave energy

Modeling of Linear and Non-linear Compression Processes of Sunflower Bulk Oilseeds

Combined thermal analysis of fluid plasticizers

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