Bulletin of the American Physical Society
Fall 2009 Meeting of the Four Corners Section of the APS
Volume 54, Number 14
Friday–Saturday, October 23–24, 2009; Golden, Colorado
Session H2: Fluids & Capillary Phenomena |
Hide Abstracts |
Chair: Bruce Doak, Arizona State University Room: Green Center 215 |
Saturday, October 24, 2009 11:20AM - 11:32AM |
H2.00001: RF Liquid Measurement Of Capillary Tubes Bashudev Poudyal, Brian Mazzeo, Karl Warnick Electromagnetic measurements of capillary tubes containing liquids can reveal solution properties for industrial, biological, and chemical processes. An analytical model was created for a perpendicular arrangement of SMA cables and a capillary tube. Numerical simulations in Ansoft High Frequency Structural Simulator were performed on the simple arrangement. The transmission parameters of the capillary tube were simulated between two lumped ports over a frequency range from 1 GHz to 20 GHz. Sensitivity of the transmission parameters to solution conditions were calculated for DI water and other variations of conductivity and permittivity. Experiments were performed on a capillary tube in a perpendicular arrangement using an HP 8720B Network Analyzer. The transmission parameters were measured and the resulting data was compared with the simulations. This measurement method can be adapted to different tube and solution conditions. [Preview Abstract] |
Saturday, October 24, 2009 11:32AM - 11:44AM |
H2.00002: Liquid ``Wires" for Microfluidics Nathan Kellis, Aaron Mazzeo, Brian Mazzeo We demonstrate liquid ``wires'' in a simple solution measurement device. This device highlights the possibility of fabricating liquid circuits. These ``wires'' were formed by filling micro-milled PMMA channels with 5M NaCl solution. Wires were connected to these salt solution channels; the impedance of a test channel filled with solution was measured by an HP 4294A Impedance Analyzer. Deionized water, 2-propanol, and 5M NaCl were measured. Numerical simulations were performed on the channel cross-section to determine the predicted impedance of the device. The simulated results were compared to the experimental data. Graphs of simulations and experiments are presented for the frequency range 1 KHz to 110 MHz. The data show electrode polarization at the electrode-electrolyte interface, as well as parasitic capacitance inherent in the experimental arrangement. [Preview Abstract] |
Saturday, October 24, 2009 11:44AM - 11:56AM |
H2.00003: Simulation of ion transport in the first vacuum stage of an Inductively Coupled Plasma Mass Spectrometer Steven Schmidt, Ross Spencer An Inductively Coupled Plasma Mass Spectrometer (ICP-MS) is an instrument used to detect trace elements in a sample and analyze its composition. In an effort to better understand this instrument the United States Department of Energy is funding research to investigate the details of its operation. A computer code called FENIX utilizing the Direct-Simulation Monte-Carlo (DSMC) algorithm has been developed and is being utilized to understand the operation of this machine. The transport of trace ions in the presence of an ambipolar electric field through the first expansion region will be presented. [Preview Abstract] |
Saturday, October 24, 2009 11:56AM - 12:08PM |
H2.00004: Thermal Conductivity of Superfluid Helium in Porous Vycor Glass William Tiernan, Silvia Ionescu, Michael Ray, Robert Hallock We report measurements of the thermal conductivity of superfluid helium in porous vycor glass. Measurements were performed at selected temperatures from 1.4 to 2.2 K and at helium pressures between 1 and 23 bar. Comparison with empty cell thermal conductivity measurements show that the superfluid contribution to thermal conductivity is very small. Our results are consistent with predictions that the normal He component should be clamped in the $\sim $7 nm vycor pores and demonstrates that our sample had no larger channels to provide a normal fluid counterflow. [Preview Abstract] |
Saturday, October 24, 2009 12:08PM - 12:20PM |
H2.00005: Modeling Ion Flow in an Inductively Coupled Plasma Mass Spectrometer using Navier-Stokes Equations Matthew Zachreson The Inductively Coupled Plasma Mass Spectrometer is a device which allows high-temperature argon gas to expand into vacuum to create an ion beam from the trace ions entrained in the flow. The steady-state drift/diffusion fluid equations have been used to model the transport of these trace ions in the first vacuum stage of this device. The effect of an ambipolar electric field has been included and is found to be important. Discrepancies exist, however, between the calculation results and experimental data collected in the vacuum region, especially where the ion flow interacts with a post-nozzle shock wave. [Preview Abstract] |
Saturday, October 24, 2009 12:20PM - 12:32PM |
H2.00006: An all optical method for lab-on-a-chip temperature measurements Adam Goering, Dan Adams, Jeff Squier, Charles Durfee, Kim Williams We demonstrate the use of Spatially and Spectrally Resolved Interferometry (SSRI) to measure minute temperature changes in picoliter volumes. The SSRI technique allows the measurement of refractive index changes as a function of temperature, frequency, and one spatial dimension within a microfluidic device. Integration of optical fibers and inexpensive light sources facilitate the progress of this method toward ``lab on a chip'' applications. Additionally, careful construction of microfluidic devices, in combination with SSRI will enable in-situ control of thermal gradients across the channel. Broad applications of this technology could include the measurements of reaction enthalpies, development of accurate temperature measurements in microfluidic devices, and precise characterization of temperature gradients. [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. |
© 2024 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