Heating analysis of a droplet on stretchable hydrophilic surface

Al-Sharafi A., Yilbas B. S., Sahin A. Z., Al-Qahtani H.

INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, cilt.85, 2020 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 85
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1016/j.ijheatfluidflow.2020.108659
  • Dergi Adı: INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Applied Science & Technology Source, Chimica, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, Metadex, Civil Engineering Abstracts
  • Anahtar Kelimeler: Elastomer, Stretching, Droplet heating, Thermal flow, WATER DROPLET, MARANGONI CONVECTION, INTERNAL FLUIDITY, SESSILE DROPLET, EVAPORATION, MODELS, TEMPERATURE, FLOW
  • İstanbul Teknik Üniversitesi Adresli: Hayır

Özet

Heating of a droplet on a stretchable hydrophilic surface is investigated and fluid dynamics in the droplet under the heating load is assessed. Elastomer wafers are considered as the sample material and the fixture is designed and manufactured to assure uniform stretching of the droplet located elastomer surface. Droplet adhesion and possible slipping/sliding of the droplet are evaluated during stretching of the sample surface. Numerical simulations are carried out to predict thermal and flow response of the droplet fluid before and after stretching. The effect of droplet volume on heating enhancement is also included in the numerical simulations. Experiments are carried out using a high-speed recording system towards comparing the flow predictions. Findings reveal that predictions are in agreement with their counterparts of experiments. Stretching of sample surface increases wetting area and lowers height of the droplet while influencing thermal flow structures in the fluid. The Nusselt and the Bond numbers increase with enlarging stretching, which becomes more visible for large droplet volume (80 mu l). Hence, stretching corresponding to 80% extension of elastomer surface gives rise to 60% improvement in the Nusselt number.