A three-dimensional DNS is performed in a particle-laden turbulent mixing layer to investigate effects of a parcel modeling on particles spatial dispersion, exchange of momentum, and interphase mass transfer which is represented by nonreactive scalar distribution evaporated from dispersed particles. Two parcel models in which each parcel has the same volume (volume fixed model, VFM) and represents the same number of particles (number fixed model, NFM) are discussed by comparing with directly tracking one by one particle without parcel model as a referred case (reference case, RC). Results show that difference in the characteristics of particle dispersion is observed between VFM and RC, while good agreement is found between NFM and RC at the upstream region of the mixing layer. However, it is found in comparing with RC that an underestimation of momentum transfer appears for VFM and NFM in whole region of the mixing layer. This is because the parcels exchange a large amount of momentum in the limited small spaces and the relative velocity is decreased locally, and then the momentum exchange is suppressed. Parcel models also cause an underestimation of evaporation from particles compared to RC. Especially, VFM is more likely to underestimate the total amount of evaporation compared to NFM.
|Publication status||Published - 2012|
|Event||12th International Conference on Liquid Atomization and Spray Systems, ICLASS 2012 - Heidelberg, Germany|
Duration: Sep 2 2012 → Sep 6 2012
|Conference||12th International Conference on Liquid Atomization and Spray Systems, ICLASS 2012|
|Period||9/2/12 → 9/6/12|
All Science Journal Classification (ASJC) codes
- Surfaces, Coatings and Films