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Received March 14, 2022
Accepted August 21, 2022
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Numerical analysis of the coupling between heat transfer and pyrolysis in heat-not-burn tobacco using computational fluid dynamics
Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea 1Korea Tomorrow and Global Corporation, 30 Gajeong-ro, Yuseong-gu, Daejeon 34128, Korea
Korean Journal of Chemical Engineering, November 2022, 39(11), 2907-2915(9), 10.1007/s11814-022-1272-3
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Abstract
This work developed a computational fluid dynamics (CFD) model to analyze and optimize the design of a heat-not-burn tobacco (HnB) device, which is an electrically heated tobacco product. The associated mathematical models were derived to express the fluid flow and pyrolysis of tobacco porous media, which is assumed to follow Darcy’ law. In addition, an apparent kinetic model was implemented as a submodel to represent tobacco pyrolysis reactions. Simulation results of the CFD model were compared with experimental data for validation. The results elucidate the interplay between the heat transfer inside the tobacco substrate and the pyrolysis reactions. Case studies were conducted to reveal that the chemical components generated in the HnB are strongly affected by the temperature distribution inside, which can be controlled by the heater design and operation. This leads us to suggest a new design which has dual heat sources of a needle heater and a wall heater controlled at 468K. The proposed design is shown to increase the nicotine generation rate by 4.6 times while generating less amounts of harmful and potentially harmful constituents (HPHCs).
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