Res. Agr. Eng., 2023, 69(2):55-64 | DOI: 10.17221/28/2021-RAE

Evaluation of low temperature drying characteristics of fresh tea leaves (Camellia assamica) in an environmental chamber using mathematical modelsOriginal Paper

Anindita Sharma, Partha Pratim Dutta
Department of Mechanical Engineering, School of Engineering, Tezpur University, Tezpur, India

Low-temperature drying (withering) is the first stage in black tea processing. Determination of appropriate end moisture content of green tea leaf as well as temperature and relative humidity (RH) maintained during withering eventually aid the final quality of the processed tea. Therefore, the tea leaf withering (partial drying) properties were evaluated in an environmental chamber using mathematical models. The temperatures and RH considered were 25, 30, 35 °C and 80, 85, 90%, respectively. A total of nine combinations of temperature and RH were considered by keeping one parameter constant. The conditions were taken adhering to that of the climatic conditions of Assam, India. The withering data from experiments were fitted into five drying models using the curve fitting method. The Page model gave better predictions with an R2 value of 0.9989 at 30 °C temperature and 90% RH. The total phenolic and flavonoid contents of the tea leaf samples were evaluated. The best results were 50.60 ± 0.02 mg GAE·g–1 (GAE – gallic acid equivalent) and 22.47 ± 0.01 mg QCE·g–1 (QCE – quercetin equivalent) at 30 °C withering temperature.

Keywords: fit; green tea-leaf; humidity; moisture ratio; wither

Published: May 30, 2023  Show citation

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Sharma A, Dutta PP. Evaluation of low temperature drying characteristics of fresh tea leaves (Camellia assamica) in an environmental chamber using mathematical models. Res. Agr. Eng. 2023;69(2):55-64. doi: 10.17221/28/2021-RAE.
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    References

    1. Akhijani H.S., Arabhosseini A., Kianmehr M.H. (2016): Effective moisture diffusivity during hot air solar drying of tomato slices. Research in Agricultural Engineering, 62: 15-23. Go to original source...
    2. Botheju W.S., Amarathunge K.S.P., Abeysinghe I.S.B. (2011a): Simulation of trough withering of tea using one dimensional heat and mass transfer finite difference model. Tropical Agricultural Research, 22: 282-295. Go to original source...
    3. Botheju W.S., Amarathunge K.S.P., Abeysinghe I.S.B. (2011b): Thin layer drying characteristics of fresh tea leaves. Journal of the National Science Foundation of Sri Lanka, 39: 61-67. Go to original source...
    4. Chayjan R.A., Kaveh M. (2016): Drying characteristics of eggplant (Solanum melongena L.) slices under microwave-convective drying. Research in Agricultural Engineering, 62: 170-178. Go to original source...
    5. Deb S., Jolvis Pou K.R. (2016): A review of withering in the processing of black tea. Journal of Biosystems Engineering, 41: 365-372. Go to original source...
    6. Dutta P.P., Baruah D.C. (2014): Drying modelling and experimentation of Assam black tea (Camellia sinensis) with producer gas as a fuel. Applied Thermal Engineering, 63: 495-502. Go to original source...
    7. Dutta P.P. (2014): Prospect of renewable thermal energy in black tea processing in Assam: An investigation for energy resources and technology. [PhD. Thesis]. Tezpur, Tezpur University.
    8. Dutta P., Dutta P.P., Kalita P. (2021): Thermal performance studies for drying of Garcinia pedunculata in a free convection corrugated type of solar dryer. Renewable Energy, 163: 599-612. Go to original source...
    9. Ghodake H.M., Goswami T.K., Chakraverty A. (2006): Mathematical modeling of withering characteristics of tea leaves. Drying Technology, 24: 159-164. Go to original source...
    10. Ghodake H.M., Goswami T.K., Chakraverty A. (2007): Moisture sorption isotherms, heat of sorption and vaporization of withered leaves, black and green tea. Journal of Food Engineering, 78: 827-835. Go to original source...
    11. Gupta R., Dey S.K., Sinha A. (2012): Analysis of tea withering process through fuzzy logic approach. Global Advanced Research Journal of Engineering, Technology and Innovation, 1: 8-15.
    12. Gupta R., Sinha A., Pandey K.M. (2014): Computational fluid dynamics study of tea withering trough considering leaf layer as porous medium. Progress in Computational Fluid Dynamics, 14: 304-315. Go to original source...
    13. Hatibaruah D., Baruah D.C., Sanyal S. (2013): Microwave drying characteristics of Assam CTC tea (Camellia assamica). Journal of Food Processing and Preservation, 37: 366-370. Go to original source...
    14. Holman J.P. (2007): Experimental Methods for Engineers. New Delhi, Tata Mc Graw Hill.
    15. Jindarat W., Sungsoontorn S., Rattanadecho P. (2013): Analysis of energy consumption in drying process of biomaterials using a combined unsymmetrical double-feed microwave and vacuum system (CUMV) - Case study: Tea leaves. Drying Technology, 31: 1138-1147. Go to original source...
    16. Kaur A., Kaur M., Kaur P., Kaur H., Kaur S., Kaur K. (2015): Estimation and comparison of total phenolic and total antioxidants in green tea and black tea. Global Journal of Bio-Science and BioTechnology, 4: 116-120.
    17. Kerio L.C., Wachira F.N., Wanyoko J.K., Rotich M.K. (2013): Total polyphenols, catechin profiles and antioxidant activity of tea products from purple leaf coloured tea cultivars. Food Chemistry, 136: 1405-1413. Go to original source... Go to PubMed...
    18. Kritsadaruangchai U., Chaiwut P., Chomnunti P., Thaochan N., Saikeur A., Pintathong P. (2019): Effect of solid state fermentation with Trichoderma spp. on phenolic content and antioxidant capacities of mature Assam tea leaves. Journal of Food Science and Agricultural Technology, 5: 106-113.
    19. Lakshmi D.V.N., Muthukumar P., Layek A., Nayak P.K. (2019): Performance analyses of mixed mode forced convection solar dryer for drying of stevia leaves. Solar Energy, 188: 507-518. Go to original source...
    20. Panchariya P.C., Popovic D., Sharma A.L. (2001): Modeling of desorption isotherm of black tea. Drying Technology, 19: 1177-1188. Go to original source...
    21. Salarikia A., Ashtiani S.M., Golzarian M.R. (2017): Comparison of drying characteristics and quality of peppermint leaves using different drying methods. Journal of Food Processing and Preservation, 41: e12930. Go to original source...
    22. Sharma A., Dutta P.P. (2018): Scientific and technological aspects of tea drying and withering: A review. Agricultural Engineering International: CIGR Journal, 20: 210-220.
    23. Sharma A., Dutta A.K., Bora M.K., Dutta P.P. (2018): Study of energy management in a tea processing industry in Assam, India. In: Proceedings of the International Conference on Renewable and Alternate Energy (ICRAE), Guwahati, Dec 4-6, 2018: 020012. Go to original source...
    24. Sharma A., Dutta P.P. (2021a): Mathematical modelling of withering characteristics of tea leaves in Assam, India. In: Kakati B., Phukan B.R., Rajbongshi T., Bora D. (eds): Advances in Science and Technology. Volume 2. New Delhi, Tata Mc Graw Hill: 197-203.
    25. Sharma A., Dutta P.P. (2021b): Exergy analysis of a solar thermal energy powered tea withering trough. In: Proceedings of the 3rd International Conference on Advances in Mechanical Engineering and Nanotechnology, Jaipur, Mar 18-19, 2021: 3123-3128. Go to original source...
    26. Sharma A., Dutta P.P. (2022): Energy, exergy, economic and environmental (4E) assessments of a tea withering trough coupled with a solar air heater having an absorber plate with Al-can protrusions. International Journal of Ambient Energy, 43: 8438-8450. Go to original source...
    27. Temple S.J., van Boxtel A.J.B. (1999): Thin layer drying of black tea. Journal of Agricultural Engineering Research, 74: 167-176. Go to original source...
    28. Vijayan S., Arjunan T.V., Kumar A. (2016): Mathematical modeling and performance analysis of thin layer drying of bitter gourd in sensible storage based indirect solar dryer. Innovative Food Science & Emerging Technologies, 36: 59-67. Go to original source...
    29. Vijayan S., Arjunan T.V., Kumar A. (2017): Thin layer drying characteristics of curry leaves (Murraya koenigii) in an indirect solar dryer. Thermal Science, 21: 359-367. Go to original source...

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