Front. Mech. Eng. Frontiers in Mechanical Engineering Front. Mech. Eng. 2297-3079 Frontiers Media S.A. 10.3389/fmech.2020.00008 Mechanical Engineering Correction Corrigendum: The Role of Heat Transfer Limitations in Polymer Pyrolysis at the Microscale Richter Franz Rein Guillermo * Department of Mechanical Engineering, Imperial College London, London, United Kingdom

Edited and reviewed by: David B. Go, University of Notre Dame, United States

 *Correspondence: Guillermo Rein g.rein@imperial.ac.uk

This article was submitted to Thermal and Mass Transport, a section of the journal Frontiers in Mechanical Engineering

 27 02 2020 2020 6 8 14 01 2020 31 01 2020 Copyright © 2020 Richter and Rein. 2020 Richter and Rein

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 A Corrigendum on The Role of Heat Transfer Limitations in Polymer Pyrolysis at the Microscale by Richter, F., and Rein, G. (2018). Front. Mech. Eng. 4:18. doi: 10.3389/fmech.2018.00018 chemistry transport kinetics cellulose TGA thermal lag

In the original article, there was an error. Equation (20) was misprinted.

A correction has been made to Discussion and Derivation of Thresholds, subsection Minimize Both Internal and External Heat Transfer Limitation, Equation (20):

Da=τEτc=2ρcR2η3kfNu

Further, Equation (21) was also misprinted. A correction has been made to Discussion and Derivation of Thresholds, subsection Minimize Both Internal and External Heat Transfer Limitation, Equation (21):

mc=0.0775πρ(kfNucη)3/2 with η=Aexp(−ERTs)with logTs=2.5+0.047logβ

Additionally, there was a mistake in the legend for Figure 8. “log Ts = 0.047 + 2.5 log β ” should be “log Ts = 2.5 + 0.047 log β”. The corrected Figure 8 legend appears below.

“Figure 8: Summary of derived and literature thresholds for transport limitations together with high-quality experiments. The threshold by Burnham et al. (2015) (mc = 10/β) is for both intra-and interparticle heat transfer. The threshold Da<0.1 (Equation 21) is for interparticle heat transfer with log Ts = 2.5 + 0.047 log β. The threshold by Lyon et al. (2012) (mc=(1.1/β)3/2) and the threshold of ΔTI < 1 K (Equation 18) are for intraparticle heat transfer. The experiments are by: Gronli et al. (diamonds) (Grønli et al., 1999), Gronli et al. (thermal lag study)(triangle right) (Grønli et al., 1999), Antal et al. (triangle up) (Antal et al., 1998), and Lin et al. (squares) (Lin et al., 2009). All boundaries and experiments, except Lyon, are for cellulose. The graph is inspired by Lyon et al. (2012) and Burnham (2017).”

Lastly, in the original article, there was an error. We neglected to include a description of the length of scales used.

A correction has been made, and the following clarification has been added to the end of the Discussion and Derivation of Thresholds section, subsection Minimize Both Internal and External Heat Transfer Limitation:

“The paper uses two definitions for the characteristic length in heat transfer. One, L1, represents the smallest distance along the maximum temperature difference. For conduction in a spherical particle that is L1 = R. The other, L2, represents the average distance for heat conduction (volume divided by surface area). For a spherical particle L2=R3. The paper uses L1 but also L2 with regards to the previous work of Hayhurst (2013). L1 is used in Equations (9–18) as well as Figures 6, 9. L2 is used in Equations (19–21) as well as in Figures 7, 8.”

The authors apologize for these errors and state that this does not change the scientific conclusions of the article in any way. The original article has been updated.

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