@article{26185,
  keywords = {Nucleation, Heat transfer, Solidification, Melt, Crystallization, Differential scanning calorimetry, Gas-diffusion layer, Kinetics, Nonisothermal crystallization, Polyesters, Polymer crystallization},
  author = {Thomas J Dursch and Monica A Ciontea and Gregory J Trigub and Clayton J Radke and Adam Z Weber},
  title = {Pseudo-isothermal ice-crystallization kinetics in the gas-diffusion layer of a fuel cell from differential scanning calorimetry},
  abstract = {<p>Non-isothermal ice-crystallization kinetics in the fibrous gas-diffusion layer (GDL) of a proton-exchange-membrane fuel cell is investigated using differential scanning calorimetry (DSC). Non-isothermal ice-crystallization rates and ice-crystallization temperatures are obtained from heat-flow measurements in a water-saturated commercial GDL at cooling rates of 2.5, 5, 10, and 25 K/min. Our previously developed isothermal ice-crystallization rate expression is extended to non-isothermal crystallization to predict ice-crystallization kinetics in a GDL at various cooling rates. Agreement between DSC experimental results and theory is good. Both show that as the cooling rate increases, ice-crystallization rates increase and crystallization temperatures decrease monotonically. Importantly, we find that the cooling rate during crystallization has a negligible effect on the crystallization rate when crystallization times are much faster than the time to decrease the sample temperature by the subcooling. Based on this finding, we propose a pseudo-isothermal method for obtaining non-isothermal crystallization kinetics using isothermal crystallization kinetics evaluated at the non-isothermal crystallization temperature.</p>},
  year = {2013},
  journal = {International Journal of Heat and Mass Transfer},
  volume = {60},
  pages = {450 - 458},
  month = {05/2013},
  issn = {00179310},
  doi = {10.1016/j.ijheatmasstransfer.2012.12.048},
}