.svg){kind=logo}
NUMERICAL ASSESSMENT OF A MICROWAVE-HEAT PUMP DRYING OF SLICED TURMERIC
Keywords:
microwave-heat pump, conjugate heat and mass transfer, drying modeling, effective moisture diffusivityDOI:
https://doi.org/10.17654/0973576325048Abstract
Microwave-heat pump drying is a low-temperature drying technique that maintains product quality with an accelerated drying rate under the microwave-thermal effect. In this work, a mathematical model of the sliced turmeric drying process is developed for both pure and microwave-assisted heat pump drying processes. The conjugate heat and mass conservation equations are written based on the concept of effective thermal conductivity and effective moisture diffusivity. Based on experimental data, the moisture diffusivity is determined based on the inverse method by minimizing the discrepancy between the numerical and experimental observations. The results indicate that a microwave power intensity of 1.5 W/gram can help to enhance the effective moisture diffusivity by more than 30%. Additionally, the impact of microwave heating on the moisture content and temperature profile with different slice thicknesses is investigated numerically. In the future, the drying kinetics predicted by the proposed model can be readily used as essential input for designing and operating the microwave-assisted heat pump drying system.
Received: October 13, 2025
Accepted: November 21, 2025
References
[1] Z. Sun, J. Chen, T. Dai, Y. Wang, R. Liang, W. Liu, C. Liu and L. Deng, Recent advances in heat pump drying system for the food industry: structure, system optimization, applications, and prospects. Comprehensive Reviews in Food Science and Food Safety 24(4) (2025), e70238.
[2] P. Guzik, P. Kulawik, M. Zając and W. Migdał, Microwave applications in the food industry: an overview of recent developments, Critical Reviews in Food Science and Nutrition 62(29) (2022), 7989-8008.
[3] N.-C. Le and T.-B.-T. Tran, Optimization of microwave-assisted heat pump drying parameters of Vietnamese black tiger shrimp using the response surface methodology, IOP Conference Series: Earth and Environmental Science 1278(1) (2023), 12012.
[4] P. Zhao, C. Liu, W. Qu, Z. He, J. Gao, L. Jia, S. Ji and R. Ruan, Effect of temperature and microwave power levels on microwave drying kinetics of Zhaotong lignite, Processes 7(2) (2019), 74.
[5] F. Akter, R. Muhury, A. Sultana and U. K. Deb, A comprehensive review of mathematical modeling for drying processes of fruits and vegetables, International Journal of Food Science 2022 (2022), 6195257.
[6] R. Parmar, B. Khanpara, M. Dabhi, A. Parmar, R. Yadav and R. Gandhi, Microwave drying of turmeric (Curcuma longa L.): RSM-based optimization of microwave power and thickness, Journal of Microwave Power and Electromagnetic Energy 59(2) (2025), 110-129.
[7] N. Seanmeema, N. Poomsa-ad and L. Wiset, Drying of turmeric (Curcuma longa) using heat pump dryer under different media, Acta Horticulturae 1213 (2018), 333-338.
[8] P. Wijaya Sunu, D. Simon Anakottapry, I. D. M. Susila, D. M. Kamal and Andoko Asrori, Heat pump drying for turmeric: a preview, Proceedings of the 5th International Conference on Applied Science and Technology on Engineering Science, Bandung, Indonesia, 2022, pp. 342-345.
[9] A. S. Mujumdar, Handbook of Industrial Drying; CRC Press, 2014.
[10] A. Aissa, M. Abdelouahab, A. Noureddine, M. Elganaoui and B. Pateyron, Ranz and Marshall correlations limits on heat flow between a sphere and its surrounding gas at high temperature, Thermal Science 19(5) (2015), 1521-1528.
[11] D. Zhao, A. Würger and X. Crispin, Ionic thermoelectric materials and devices, Journal of Energy Chemistry 61 (2021), 88-103.
Downloads
Published
Issue
Section
License
Copyright (c) 2025 PUSHPA PUBLISHING HOUSE, PRAYAGRAJ, INDIA
This work is licensed under a Creative Commons Attribution 4.0 International License.
____________________________
Attribution: Credit Pusha Publishing House as the original publisher, including title and author(s) if applicable.
Non-Commercial Use: For non-commercial purposes only. No commercial activities without explicit permission.
No Derivatives: Modifying or creating derivative works not allowed without written permission.
Contact Pusha Publishing House for more info or permissions.
