Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Institution
- Publication
- File Type
Articles 31 - 34 of 34
Full-Text Articles in Engineering
An Experimental Study On Pulsed Spray Cooling With Refrigerant R-404a In Laser Surgery, Zhifu Zhou, Bin Chen, Yueshe Wang, Liejin Guo, Guo-Xiang Wang
An Experimental Study On Pulsed Spray Cooling With Refrigerant R-404a In Laser Surgery, Zhifu Zhou, Bin Chen, Yueshe Wang, Liejin Guo, Guo-Xiang Wang
Dr. Guo-Xiang Wang
With a low boiling point (−45.5 °C at 1 atm) and high volatility, cryogen R-404a has the potential to replace current R-134a (−26.1 °C at 1 atm) for improved therapeutic outcome of dark skins in cutaneous laser treatment. This paper presents an experimental study on pulse spray cooling with cryogen R-404a including the spray characteristics and the resulting dynamic cooling of a solid surface. The spray system includes a special designed pressure nozzle (with the tube diameter less than 1 mm) that is connected to a fast response electric valve which can open or close within 5 ms. A high-speed …
Experimental Study On The Vascular Thermal Response To Visible Laser Pulses, D. Li, B. Chen, W. Wu, Guo-Xiang Wang, Y. He, Z. Ying
Experimental Study On The Vascular Thermal Response To Visible Laser Pulses, D. Li, B. Chen, W. Wu, Guo-Xiang Wang, Y. He, Z. Ying
Dr. Guo-Xiang Wang
Port-wine stains (PWSs) are congenital vascular malformations that progressively darken and thicken with age, and laser therapy is the most effective in clinical practice. Using dorsal skin chamber (DSC), this study evaluated thermal response of blood vessel to a 595-nm pulsed dye laser (PDL) with controlled energy doses and pulse durations. Totally, 32 vessels (30∼300 μm in diameter) are selected from the dorsal skin of the mouse to match those in port-wine stain. The experimental results showed that the thermal response of the blood vessels to laser irradiation can be recognized as coagulation, constriction with diameter decrease, disappearance (complete constriction), …
An Experimental Study On The Spray And Thermal Characteristics Of R134a Two-Phase Flashing Spray, Zhou Zhifu, Wu Weitao, Chen Bin, Guo-Xiang Wang, Guo Liejin
An Experimental Study On The Spray And Thermal Characteristics Of R134a Two-Phase Flashing Spray, Zhou Zhifu, Wu Weitao, Chen Bin, Guo-Xiang Wang, Guo Liejin
Dr. Guo-Xiang Wang
Flashing spray of volatile liquids is a common phenomenon observed in many industrial applications such as fuel injection of engines, accidental release of flammable and toxic pressure-liquefied gases, failure of a vessel or pipe in the form of a small hole in chemical industry, and cryogenic spray cooling in laser dermatology, etc. In flashing spray, the volatile liquid is depressurized rapidly at the exit of a nozzle (or a hole in a vessel) and becomes superheated. Such superheated liquid (in the form of either a jet or droplets) will lead to explosive atomization with fine droplet and a short spray …
Quantitative Modeling Of The Equilibration Of Two-Phase Solid-Liquid Fe By Atomistic Simulations On Diffusive Time Scales, Ebrahim Asadi, Mohsen Asle Zaeem, Sasan Nouranian, Michael Baskes
Quantitative Modeling Of The Equilibration Of Two-Phase Solid-Liquid Fe By Atomistic Simulations On Diffusive Time Scales, Ebrahim Asadi, Mohsen Asle Zaeem, Sasan Nouranian, Michael Baskes
Mohsen Asle Zaeem
No abstract provided.