Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

Sorted by: relevance · author · university · dateNew search

You searched for subject:(spreading diameter). Showing records 1 – 2 of 2 total matches.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


University of Newcastle

1. Nguyen, Thi Bang Tuyen. Vaporisation of single and binary component droplets in heated flowing gas stream and on solid sphere.

Degree: PhD, 2018, University of Newcastle

Research Doctorate - Doctor of Philosophy (PhD)

Droplet vaporisation is significant to a number of multiphase process engineering applications which include but not limited to Fluid Catalytic Cracking (FCC) process for producing transport fuel; fluid coking for producing fuel gas, distillate and petroleum coke; spray coating of tablets in pharmaceutical industry; drying of seeds in spouted bed in food industry and spray drying of milk in dairy industry. The principal aim of this study was to improve the physical understanding the droplet vaporisation in a multiphase environment due to both convective (homogeneous vaporisation) and conductive heat transfer (heterogeneous vaporisation) with the aid of experimental measurement and numerical modelling. The principal aim was met first by numerically quantifying the feed droplet vaporisation time in a typical multiphase application (FCC riser) including both homogeneous and heterogeneous modes; and then separately investigating these two modes by experimentally quantifying the vaporisation behaviour of a suspended droplet in a hot convective flow and on a heated spherical particle, respectively. A comprehensive quantitative comparison of the existing models (both homogeneous and heterogeneous) was conducted to predict FCC feed droplet vaporisation time under typical industrial operating conditions. Noting a dearth of suitable physical model that accounts for the conductive heat transfer between feed droplets and catalyst particles, a new vaporisation model based on the particle-droplet collision mechanism was proposed which provided a reasonable agreement with the available heterogeneous models. It was noted that all homogeneous models predicted a larger droplet vaporisation time compared to the heterogeneous models which could be attributed to the large difference in the Nusselt number in these two modes of heat transfer. Evaporation behaviour of binary mixtures droplet in high Reynolds number (~ 714) environment was next studied experimentally and a numerical model was developed. Transient change in droplet size and temperature were measured for both pure component system (water) and a polar binary system (70 % water and 30 % glycerol) at free stream temperature ~ 353 K and superficial gas velocity ~ 4.3 m/s. Reasonable agreements with the model predictions were obtained for single component system however some deviation was noted for binary system specifically at the transition stage which was attributed to the liquid phase diffusional resistance due to high system viscosity. Transient droplet temperature measurements were performed which showed an unsteady heating stage followed by a thermal equilibrium stage. The unsteady heating stage was shown to be within the two limits of characteristic thermal convection and mass diffusion time scale. Heterogeneous vaporisation behaviour was examined by the experimental studies of binary mixture droplets evaporating on heated spherical particle. Effect of liquid composition for three different binary system droplets…

Advisors/Committee Members: University of Newcastle. Faculty of Engineering & Build Environment, School of Engineering.

Subjects/Keywords: droplet evaporation; heat transfer; mass transfer; contact angle; spreading diameter; internal motions; unsteady heating

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Nguyen, T. B. T. (2018). Vaporisation of single and binary component droplets in heated flowing gas stream and on solid sphere. (Doctoral Dissertation). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/1392739

Chicago Manual of Style (16th Edition):

Nguyen, Thi Bang Tuyen. “Vaporisation of single and binary component droplets in heated flowing gas stream and on solid sphere.” 2018. Doctoral Dissertation, University of Newcastle. Accessed October 16, 2019. http://hdl.handle.net/1959.13/1392739.

MLA Handbook (7th Edition):

Nguyen, Thi Bang Tuyen. “Vaporisation of single and binary component droplets in heated flowing gas stream and on solid sphere.” 2018. Web. 16 Oct 2019.

Vancouver:

Nguyen TBT. Vaporisation of single and binary component droplets in heated flowing gas stream and on solid sphere. [Internet] [Doctoral dissertation]. University of Newcastle; 2018. [cited 2019 Oct 16]. Available from: http://hdl.handle.net/1959.13/1392739.

Council of Science Editors:

Nguyen TBT. Vaporisation of single and binary component droplets in heated flowing gas stream and on solid sphere. [Doctoral Dissertation]. University of Newcastle; 2018. Available from: http://hdl.handle.net/1959.13/1392739

2. Mezbah, Uddin Mohammad. Dynamic processes and boiling phenomena during droplet and hot surface interaction(Summary).

Degree: 修士(環境学), 2017, The University of Tokyo / 東京大学

Subjects/Keywords: Surface roughness; drop velocity; drop spreading diameter; superheat temperature; subcooling effect

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Mezbah, U. M. (2017). Dynamic processes and boiling phenomena during droplet and hot surface interaction(Summary). (Thesis). The University of Tokyo / 東京大学. Retrieved from http://hdl.handle.net/2261/43041

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Mezbah, Uddin Mohammad. “Dynamic processes and boiling phenomena during droplet and hot surface interaction(Summary).” 2017. Thesis, The University of Tokyo / 東京大学. Accessed October 16, 2019. http://hdl.handle.net/2261/43041.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Mezbah, Uddin Mohammad. “Dynamic processes and boiling phenomena during droplet and hot surface interaction(Summary).” 2017. Web. 16 Oct 2019.

Vancouver:

Mezbah UM. Dynamic processes and boiling phenomena during droplet and hot surface interaction(Summary). [Internet] [Thesis]. The University of Tokyo / 東京大学; 2017. [cited 2019 Oct 16]. Available from: http://hdl.handle.net/2261/43041.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mezbah UM. Dynamic processes and boiling phenomena during droplet and hot surface interaction(Summary). [Thesis]. The University of Tokyo / 東京大学; 2017. Available from: http://hdl.handle.net/2261/43041

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.