Bulletin of the American Physical Society
72nd Annual Meeting of the APS Division of Fluid Dynamics
Volume 64, Number 13
Saturday–Tuesday, November 23–26, 2019; Seattle, Washington
Session L24: Bubbles: Growth, Heat Transfer and Boiling II |
Hide Abstracts |
Chair: Andrea Prosperetti, U Houston Room: 606 |
Monday, November 25, 2019 1:45PM - 1:58PM |
L24.00001: ABSTRACT WITHDRAWN |
Monday, November 25, 2019 1:58PM - 2:11PM |
L24.00002: Light-guided surface plasmonic bubble movement via contact line de-pinning by in-situ deposited plasmonic nanoparticle heating. Qiushi Zhang, Eungkyu Lee, Yunsong Pang, Jarrod Schiffbauer, Aleksandar Jemcov, Hsueh-Chia Chang, Tengfei Luo Precise spatio-temporal control of surface bubble movement can benefit a wide range of applications like high-throughput drug screening, combinatorial material development, microfluidic logic, colloidal and molecular assembly, etc. In this work, we demonstrate that surface bubbles on a solid surface are directed by a laser to move at high speeds (\textgreater 1.8 mm/s), and we elucidate the mechanism to be the de-pinning of the three-phase contact line (TPCL) by rapid plasmonic heating of nanoparticles (NPs) deposited in-situ during bubble movement. Based on our observations, we deduce a stick-slip mechanism based on asymmetric fore-aft plasmonic heating: local evaporation at the front TPCL due to plasmonic heating de-pins and extends the front TPCL, followed by the advancement of the trailing TPCL to resume a spherical bubble shape to minimize surface energy. The continuous TPCL drying during bubble movement also enables well-defined contact line deposition of NP clusters along the moving path. Our finding is beneficial to various microfluidics and pattern writing applications. [Preview Abstract] |
Monday, November 25, 2019 2:11PM - 2:24PM |
L24.00003: The physics of plasmonic vapor-gas bubbles in a gassy liquid Yuhang Zhang, Andrea Prosperetti When illuminated by resonant irradiation of a continuous-wave laser, gold nanoparticles deposited on a surface immersed in a liquid generate huge amount of heat in a very short period of time, leading to the nucleation of vapor bubbles referred to as “plasmonic bubbles.” In this work, a spherically symmetric mathematical model is proposed to describe the various physical processes that affect the dynamics of these bubbles: growth, condensation, the diffusion of dissolved gas into and out of the bubble and the attendant mass and heat transfer. The model is solved by transforming the partial differential equations into a system of ordinary differential equations using a collocation method. The different phases of the bubble behavior on short (microseconds) and longer (milliseconds to seconds) time scales found in experiments are reproduced by the numerical simulations. The effects of the degree of dissolved gas saturation in the liquid are discussed. [Preview Abstract] |
Monday, November 25, 2019 2:24PM - 2:37PM |
L24.00004: Direct Numerical Simulations of Surfactant Effects on Heat and/or Mass Transfer Around a Bubble Thomas Abadie, Omar Matar Contaminants or surfactants are involved in a wide range of environmental and industrial applications and their presence can affect significantly both the dynamics and transfer phenomena around bubbles and droplets. In this study, a front-tracking method is presented and assessed in order to model accurately surface tension forces for capillary driven flows and heat and mass transfer around a bubble rising in a continuous liquid phase. The effects of Marangoni stresses on the bubble dynamics on the one hand and on the Sherwood or Nusselt number on the other are investigated as a first step towards improve the understanding of heat and/or mass transfer in contaminated bubble swarms. [Preview Abstract] |
Monday, November 25, 2019 2:37PM - 2:50PM |
L24.00005: Bubble Dynamics on Nanostructured Microwires Lauren Coertze, Daniel Orejon Mantecon, Marilize Everts, Prashant Valluri, Josua Meyer, Khellil Sefiane Boiling on microwires is investigated aiming to provide a better understanding of the bubble dynamics and heat transfer as these are of great importance to many industrial and everyday processes. It is proposed that nanoparticle surface coatings may be a simple and scalable method of modifying the surface wettability and structure with the associated differences in bubble-surface interactions and the consequent variations in bubble dynamics, critical heat flux (CHF) and heat transfer coefficient. This work aims to develop an improved understanding of bubble dynamics such as bubble velocity, growth rate, bubble density distribution and detachment frequency on coated microwires at various heat fluxes. Experimental investigations will consider nanoparticle coated and bare platinum microwires with diameters of 100 and 250 micrometres, in pool boiling with water as working fluid. High speed, high resolution videography will be used to observe bubbles from nucleation to departure. The analysis will focus on the bubble dynamics occurring on nanoparticle coated and bare microwires. Bubble dynamics and CHF for the coated surfaces are expected to change compared to the bare wire depending on the nature of the surface coating applied. [Preview Abstract] |
Monday, November 25, 2019 2:50PM - 3:03PM |
L24.00006: Heat transport by bubbles in vertical natural convection Chong Shen Ng, Roberto Verzicco, Detlef Lohse We consider a basic configuration of bubbles in vertical natural convection. The datasets are obtained from direct numerical simulations for one decade of Rayleigh numbers, a Prandtl number of 7 and the bubbles are simulated with immersed boundaries using the interaction potential approach. By separately enabling the thermal and mechanical coupling, we show evidence that the heat transport is enhanced when the bubbles are both thermally and mechanically coupled to the flow. When only pure mechanical coupling is considered, we instead find a lower heat flux in the system. The enhanced heat flux from the addition of thermal coupling highlights the importance of thermal transport by bubbles in this setup. To shed light on the details of the mechanism, we discuss the contributions to the heat flux with reference to local statistics of the thermal boundary layers. [Preview Abstract] |
Monday, November 25, 2019 3:03PM - 3:16PM |
L24.00007: Direct numerical simulation of heat transfer in turbulent bubbly pipe flow In-Koo Lee, Jaehee Chang, Haecheon Choi In pipe flows occurred in a reactor of a nuclear power plant and a radiator tube in a car, forced convection with bubbles occasionally occurs in an undesirable manner. These bubbles significantly change the flow structures and heat transfer in a pipe. We perform direct numerical simulation of fully developed turbulent bubbly flow with heat transfer in a vertical pipe to examine the variations of flow structure and heat transfer due to bubbles. The phase interface is tracked by level-set method in the Cartesian coordinates. The simulation results show that heat transfer is enhanced by the motion induced by counter-rotating vortices existing in the rear of the bubble. As the bubble volume fraction increases, the radial distribution of bubbles becomes flat due to the interaction among bubbles. This flat bubble distribution results in flattened temperature profile in the radial direction. Therefore, the rate of increase in the heat transfer coefficient decreases with increasing bubble volume fraction. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2025 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700