Transient analysis of heat and mass transfer during heat treatment of wood including pressure equation

Younsi, R.; Kadem, S.; Lachemet, A.; Kocaefe, Duygu

doi:10.2298/tsci120309113y

Cited by 11 publications

(5 citation statements)

References 19 publications

(19 reference statements)

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“…Similarly, Younsi et al (2015) claimed that simulating the proposed conjugate problem allowed them to evaluate the impact of heat and mass transfer in wood. Shi et al (2013) to evaluate the thin-layer drying kinetics of Yacon at temperatures ranging from 5 to 45 C and air speeds ranging from 0.5 to 2.0 m/s.…”

Section: Mathematical Modeling Using Computational Fluid Dynamics (Cfd)mentioning

confidence: 99%

Mathematical modeling of drying characteristics for cylindrical Thompson seedless grapes under natural convection

Komble

Kulkarni

Dhamangaonkar

et al. 2023

J Food Process Engineering

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The objective of this paper is to develop a universal diffusion model of drying kinetics that can be applied to a variety of shrinkable products such as fruits and vegetables.The main objective is to examine the physical changes that occur during convective air-drying process of Thompson seedless type cylindrical grapes. These include changes in the physical properties of the product, such as the moisture content, the temperature of the product, and the size of the product. The authors develop a twodimensional transient diffusion model and MATLAB that takes into account convection, radiation, and evaporation phenomena under a variety of operating conditions for simulating grape drying and shrinkage. The differential equations are solved for moisture transfer within a cylinder using the finite difference method. A lab-scale experimental test setup has also been developed and tests are performed. The results obtained from the mathematical model are compared with experimental results and found to be in agreement with a maximum error of 14%. The model is also validated with the results reported in the literature. Meteorological data are used to determine the time-dependent radiation flux density (I(t)) on a particular day. For each of the investigated conditions, the effective moisture diffusivity (D eff ) is determined using Fick's diffusion equation. Volume reduction of a product due to drying process was assumed to be equivalent to moisture removal. A coefficient of effective diffusivity was calculated using drying data collected at constant cabin air temperatures between 50 and 70 C. The maximum radius and length of the grape were reduced by 40.33% and 42.40%, respectively, when the size of the grape was considered to be 6.5 mm radius and 25 mm length. The results of the present mathematical model may be useful for accurately predicting the temperature, moisture content, and size change of the product. Practical ApplicationDrying food to preserve it is an energy-intensive process. Solar drying is one of the oldest methods used to preserve agricultural produce. Solar thermal energy has tremendous potential for commercial and industrial drying applications with air temperatures as high as 80 C. Solar drying is prevalent in India because farmers have easy access to solar drying systems. Through the installation of such a system, agricultural products can be dried in agricultural regions. This work provides farmers with added

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Section: Mathematical Modeling Using Computational Fluid Dynamics (Cfd)mentioning

confidence: 99%

Mathematical modeling of drying characteristics for cylindrical Thompson seedless grapes under natural convection

Komble

Kulkarni

Dhamangaonkar

et al. 2023

J Food Process Engineering

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“…The validation of the Luikov's model was already carried out by comparing the predictions of the model with the experimental results obtained during the high temperature treatment of Jack Pine (Pinus banksiana Lamb) wood. More detailed information on the validation is given elsewhere [19][20][21]. We have also tried to validate the model with the experimental and numerical results obtained from Jia and Afzal [26] for 2-D microwave drying of white oak.…”

Section: Thermo-physical Properties Of Woodmentioning

confidence: 99%

“…Hukka [18] studied a 2-D model for the stress analysis of drying wood. Younsi et al [19][20][21] considered heat treatment of wood by solving diffusion equation in wood and turbulent Navier-Stokes equation in the fluid field for Thermo-wood technology. The experimental results and the model predictions were found to be in good agreement.…”

Section: Introductionmentioning

confidence: 99%

Computational analysis of heat and mass transfer during microwave drying of timber

2016

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The need for improvement in engineering design and process optimization for microwave drying of wood has stimulated the development of computer simulation techniques to predict temperature and moisture history and distribution wood sample. A 3-D comprehensive heat and mass transfer model was developed to simulate the free liquid, vapor, and bound water movement including consideration of internal heat generation in microwave drying of yellow poplar specimens. The model was solved using the finite element analysis with FEMLAB software. The model predictions compared favorably with predicted and experimental solutions. The effect of changes of the most important parameters on the predictions of the model is also presented. The results showed that the variations of irradiation time, microwave power level and sample thickness played an important role in overall drying kinetics.

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“…Önerilen birleşik problemin benzeştiriminin ahşap içinde ısı ve kütle transferinin etkisinin değerlendirilmesine olanak sağladığı belirlenmiştir [25]. Yankee motor kapağının yapılandırılmasında kullanılan pelür kâğıdının üretimi için enerji performansının en uygun hale getirilmesine imkân sağlayan çarpan hava kurutma sistemlerinin kapsamlı ve özgün matematiksel modellemesi raporlandırılmış ve matematiksel modelin geçerliliği, var olan pelür kağıdı milinden alınan gerçek veriyle karşılaştırılarak değerlendirilmiştir.…”

Section: Introductionunclassified

Investigation of air jet impingement drying with forced convection of moist things

Karabulut¹,

Alnak²

2019

Pamukkale J Eng Sci

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Bu çalışmada, tam ve düz yarı dairesel olmak üzere iki farklı nemli nesne geometrisinin hava jeti ile kurutulmasının ısı transferi artışı ve nem miktarındaki azalışı üzerindeki etkisi sayısal olarak incelenmiştir. Jet kurutması, nemli nesneden sabit bir jet uzaklığında konumlandırılmış, laminer ve iki boyutludur. Tüm durumlarda, nemli nesnenin çapı, nemli nesneden olan jet uzaklığı ve jet giriş yüksekliği sabit alınmıştır. Farklı jet hızları için nesnelerin etrafındaki akım çizgileri ve eş sıcaklık eğrileri görselleştirilmiştir. Korunum denklemlerini çözmek için sonlu hacim yöntemi olan ANSYS Fluent 17.0 bilgisayar programı kullanılmıştır. Hesaplamalar, Re=100, 200 ve 300 olarak farklı Reynolds sayıları için gerçekleştirilmiştir. Çalışmanın, literatürde var olan sayısal ve deneysel çalışmayla iyi bir uyum içinde olduğu bulunmuştur. Sonuçlar, tam dairesel nemli nesnenin düz yarı dairesel nemli nesneden daha iyi ısı ve nem transferi performansına sahip olduğunu göstermiştir. Ayrıca, Reynolds sayısının artışının ısı ve nem transferi üzerinde olumlu bir etkiye sahip olduğu görülmüştür. Yerel olarak, jet kurutmanın nesnelerin ön taraflarındaki durma noktasına yakın daha etkili oldukları bulunmuştur. In this work, the effect of drying with jet of air of two dissimilar moist thing geometries with whole and straight semi-circular on the enhancement of heat transfer and decrement of moisture amount was numerically examined. The drying jet had a laminar flow characteristic and two-dimensional jet situated at a fixed jet space from the moist thing. The moist thing diameter, jet space from the moist thing and height of jet initial were taken as stable in whole situations. Streamlines and isotherms were visualized around the things for dissimilar velocities of jet. A method of finite volume was used to figure out the conservation equations by employing software program of ANSYS Fluent 17.0. Computations were conducted for dissimilar Re, so, Re = 100, 200 and 300. It was obtained well accord with scalar and empirical output found in the reference. The results illustrated that the whole circular moist thing had greater good heat and moisture transfer performance than that of the straight semi-circular moist thing. Furthermore, it was seen that an increase of Re number had an affirmative effect on heat and moisture transfer. As locality, drying of jet was appeared to be most powerful close to the stillness point on the front face of the things.

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Transient analysis of heat and mass transfer during heat treatment of wood including pressure equation

Cited by 11 publications

References 19 publications

Mathematical modeling of drying characteristics for cylindrical Thompson seedless grapes under natural convection

Mathematical modeling of drying characteristics for cylindrical Thompson seedless grapes under natural convection

Computational analysis of heat and mass transfer during microwave drying of timber

Investigation of air jet impingement drying with forced convection of moist things

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