Experimental study and analysis of porous thin plate drying in a convection dryer

Sekone, Abdoul Karim; Hung, Yu-Yung; Yeh, Chih-Ting; Lee, Ming-Tsang

doi:10.1016/j.icheatmasstransfer.2015.08.019

Cited by 6 publications

(5 citation statements)

References 41 publications

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“…The plate was fully saturated with distilled water before the drying experiment was started. More details of the drying experimental procedure can be found in a previously reported study [ 36 ]. The experiments included both natural drying and solar drying procedures.…”

Section: Methodsmentioning

confidence: 99%

Silicon Nanowires for Solar Thermal Energy Harvesting: an Experimental Evaluation on the Trade-off Effects of the Spectral Optical Properties

et al. 2016

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Silicon nanowire possesses great potential as the material for renewable energy harvesting and conversion. The significantly reduced spectral reflectivity of silicon nanowire to visible light makes it even more attractive in solar energy applications. However, the benefit of its use for solar thermal energy harvesting remains to be investigated and has so far not been clearly reported. The purpose of this study is to provide practical information and insight into the performance of silicon nanowires in solar thermal energy conversion systems. Spectral hemispherical reflectivity and transmissivity of the black silicon nanowire array on silicon wafer substrate were measured. It was observed that the reflectivity is lower in the visible range but higher in the infrared range compared to the plain silicon wafer. A drying experiment and a theoretical calculation were carried out to directly evaluate the effects of the trade-off between scattering properties at different wavelengths. It is clearly seen that silicon nanowires can improve the solar thermal energy harnessing. The results showed that a 17.8 % increase in the harvest and utilization of solar thermal energy could be achieved using a silicon nanowire array on silicon substrate as compared to that obtained with a plain silicon wafer.

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Section: Methodsmentioning

confidence: 99%

Silicon Nanowires for Solar Thermal Energy Harvesting: an Experimental Evaluation on the Trade-off Effects of the Spectral Optical Properties

et al. 2016

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“…The results indicated that the Dincer model had a high degree of fit for the drying kinetics of licorice extract. The function coefficient S is a parameter characterizing the drying performance of solid materials, which is related to the water diffusivity of materials 33 . As evident from Table 1, with an increase of ultrasonic power, the value of drying coefficient S increased.…”

Section: Resultsmentioning

confidence: 99%

Effects of ultrasonic power on drying kinetics and product quality of licorice extract during ultrasound‐assisted vacuum drying

Wang,

Zhang

et al. 2024

J Sci Food Agric

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BACKGROUNDLicorice extract is an important raw material for food additives and medicine. The quality of licorice extract is dictated by the drying process. The commonly used drying methods of licorice extract are not efficient in obtaining high‐quality products so alternative techniques need to be developed and researched. In this study, ultrasound‐assisted vacuum drying (UAVD) was first utilized to improve drying efficiency and produce a higher‐quality product. The changes in water mobility of licorice extract during drying were characterized using low‐field nuclear magnetic resonance. In addition, the effects of ultrasonic power on the drying dynamics, the contents of liquiritin and glycyrrhizic acid, the antioxidant capacity and the microstructure formation of licorice extract during the whole drying process were investigated.RESULTSThe drying times for licorice extract to reach equilibrium moisture content were reduced by 9.09–69.70% with UAVD at 40–200 W compared with that without ultrasonic treatment (0 W). Moreover, the proportions of bound water and semi‐bound water in fresh concentrate were 3.75% and 96.25%. It was also found that high ultrasonic power promoted the flow of water and the formation of porous structure in licorice extract, which led to the improvement of drying efficiency. The contents of liquiritin (2.444%) and glycyrrhizic acid (6.514%) were retained to a large degree in the dried product at an ultrasonic power of 80 W. The DPPH inhibition rate of UAVD samples with different ultrasonic powers ranged from 84.07 ± 0.46% to 90.65 ± 0.22%.CONCLUSIONUAVD has the advantages of high efficiency and low energy consumption, which may be an alternative technology for vacuum drying widely used in industry. © 2024 Society of Chemical Industry.

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“…As we used a commercial humidity sensor, we undertook a few considerations that we discuss next. The basic governing equations (Sekone, Hung, Yeh, & Lee, 2015) are

\frac{\partial}{\partial x} ((), φ \frac{\partial Ω}{\partial x}) goodbreak= \frac{\partial Ω}{\partial t}

…”

Section: Methodsmentioning

confidence: 99%

“…The specific humidity was calculated from the relative humidity (RH) using the saturated vapor pressure of dry air ( P _sat) and atmospheric pressure ( P _atm), described by Akpinar (2004) as

italicMC goodbreak= \frac{0.662 * italicRH * P_{sat}}{P_{atm} - italicRH * P_{sat}}

In Equation (8), we discussed Fourier's law of conduction, which draws an analogy from transient moisture diffusion as discussed by Dincer and Hussain (2004). The variation of relative humidity with time during all three stages of drying (Sekone et al, 2015) is shown in Figure 2.…”

Section: Methodsmentioning

confidence: 99%

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Design process of a vacuum freeze dryer: Simultaneous endpoint determination using measurement of both temperature and relative humidity

Kumar

Yao

2022

J Food Process Engineering

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Experiments were conducted with pure water to study the various temperature and humidity parameters that can be used to develop the process of a vacuum freeze dryer (VFD). Both temperature and humidity sensors were applied to investigate characteristics such as the resistance offered during drying, heat‐transfer coefficients, moisture content, diffusivity, and others that can influence the process of vacuum freeze‐drying during primary drying. These experiments helped to develop an efficient and optimized process. We discuss the importance of various parameters on drying and the ways in which one can accomplish the experiment of drying. Two conditions, humidity and temperature, were combined to obtain a concurrent output for the start and endpoint of steps involved in freeze‐drying. From the process discussed, we state that when % RH lies between 8% and 10%, primary drying begins and when it lies between 1% and 3%, secondary drying begins.Practical ApplicationsThe practice applications for developed techniques in this manuscript would be food industry, storage of smallpox vaccines, manufacturing of enzymes, proteins, or drugs, and other bio‐related applications by a vacuum freeze dryer (VFD).

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Experimental study and analysis of porous thin plate drying in a convection dryer

Cited by 6 publications

References 41 publications

Silicon Nanowires for Solar Thermal Energy Harvesting: an Experimental Evaluation on the Trade-off Effects of the Spectral Optical Properties

Silicon Nanowires for Solar Thermal Energy Harvesting: an Experimental Evaluation on the Trade-off Effects of the Spectral Optical Properties

Effects of ultrasonic power on drying kinetics and product quality of licorice extract during ultrasound‐assisted vacuum drying

Design process of a vacuum freeze dryer: Simultaneous endpoint determination using measurement of both temperature and relative humidity

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