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  • Open Access



    M.A. Waheeda, C.A. Komolafeb,*

    Frontiers in Heat and Mass Transfer, Vol.12, pp. 1-7, 2019, DOI:10.5098/hmt.12.8

    Abstract The drying kinetics of three varieties of cocoa beans (N38, F and WA) at 40, 50 and 60 degree centigrade was investigated experimentally. The three different varieties were dried using laboratory air oven UF Memmert and the moisture content determined according to AOAC standards. The results show that drying processes occur mainly in the range of the falling-rate period and the drying rates were observed to be faster at higher drying temperature. The effective diffusivities of the three cocoa beans varieties determined at 40, 50 and 60 degree centigrade ranged between 9.9269 x 10-11 and 4.4671 x 10-10 metre square… More >

  • Open Access



    Le Anh Duca , Pham Van Kienb,*, Nguyen Thanh Tanb, Doan Thanh Sonb, Nhanh Van Nguyenc, Ngoc Xuan Nguyend

    Frontiers in Heat and Mass Transfer, Vol.20, pp. 1-6, 2023, DOI:10.5098/hmt.20.25

    Abstract This study focused on the heat and mass transfer in radio (RF) assisted heat pump (HP) drying of carrots. The experimental drying of carrot by RF assisted HP drying method was conducted to evaluate the effect of RF power on drying efficiency including drying rate and heating rate. The input drying parameters were drying air temperature of 45oC, drying air velocity of 2.5 m/s and RF power of 0, 0.5 and 1.5 kW, in which, RF power of 0 was corresponding to HP drying method. The experimental drying results showed that in RF assisted HP drying method, the drying rate… More >

  • Open Access


    Multiple Phase Change Materials for Performance Enhancement of a Solar Dryer with Double Pass Collector

    Ahmed J. Hamad*, Fawziea M. Hussien, Johain J. Faraj

    Energy Engineering, Vol.118, No.5, pp. 1483-1497, 2021, DOI:10.32604/EE.2021.016867

    Abstract The fluctuation in drying temperature influences the food products’ quality and drying time significantly during the drying process using an indirect solar dryer. One of the effective methods to reduce these variations in the temperature is based on thermal storage materials to control the drying temperature. An experimental investigation is presented in this study to evaluate the performance of an indirect solar dryer with air double pass using multiple phase change materials (PCM) as thermal storage materials. Two PCMs with different melting points are used to store the available heat energy during peak sunshine periods and reduce the drying temperature… More >

  • Open Access


    Soil drying rate and gas exchange of three Phaseolus vulgaris L. varieties

    Aguirre-Medina1 JF, J Kohashi-Shibata2, J Cadena-Iñiguez2, C Avendaño-Arrazate2

    Phyton-International Journal of Experimental Botany, Vol.77, pp. 31-48, 2008, DOI:10.32604/phyton.2008.77.031

    Abstract Intermittent drought is the main limiting factor for bean production in Mexico. The root system of three bean varieties of different origin and tolerance to water stress was exposed to different drying soil rates. The synthetic varieties were: Pinto Villa (PV, water stress tolerant) and Bayo Madero (BM, water stress susceptible) both of mesoamerican origin and growth habit type III (climbing habit), and ICA Palmar (water stress tolerant) of Andean origin and growth habit type I (shrub). Treatments were three soil drying rates, which were achieved by stopping irrigation and either maintaining or removing the pot cover made with PVC… More >

  • Open Access


    Application of a Diffusion Model to Predict Drying Kinetics Changes Under Variable Conditions: Experimental and Simulation Study

    L. Bennamoun1, A. Belhamri2, A. Ali Mohamed

    FDMP-Fluid Dynamics & Materials Processing, Vol.5, No.2, pp. 177-192, 2009, DOI:10.3970/fdmp.2009.005.177

    Abstract This study focuses on the interplay between drying kinetics (encountered in typical industrial processes and particularly in the context of solar drying) and the possible variation of external (e.g., environmental) conditions. Theoretical models of these behaviours are introduced. Experimental results confirmed by simulation are also presented. Variation of the thermo physical properties of air is taken into account in terms of variation of viscosity, density and coefficient of diffusion. In particular, this coefficient is calculated from experimental data and expressed as a function of the wet bulb air temperature. When external conditions are modified and, as a natural consequence, also… More >

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