TY - JOUR T1 - Characterization of the Temperature Oscillation Technique to Measure the Thermal Conductivity of Fluids JF - International Journal of Heat and Mass Transfer Y1 - 2006 A1 - Prajesh Bhattacharya A1 - S. Nara A1 - P. Vijayan A1 - Tang, T. A1 - W. Lai A1 - Patrick E. Phelan A1 - Ravi S. Prasher A1 - David W. Song A1 - J. Wang KW - Temperature oscillation technique KW - Thermal conductivity KW - thermal diffusivity AB -

The temperature oscillation technique to measure the thermal diffusivity of a fluid consists of filling a cylindrical volume with the fluid, applying an oscillating temperature boundary condition at the two ends of the cylinder, measuring the amplitude and phase of the temperature oscillation at any point inside the cylinder, and finally calculating the fluid thermal diffusivity from the amplitude and phase values of the temperature oscillations at the ends and at the point inside the cylinder. Although this experimental technique was introduced by Santucci and co-workers nearly two decades ago, its application is still limited, perhaps because of the perceived difficulties in obtaining accurate results. Here, we attempt to clarify this approach by first estimating the maximum size of the liquid’s cylindrical volume, performing a systematic series of experiments to find the allowable amplitude and frequency of the imposed temperature oscillations, and then validating our experimental setup and the characterization method by measuring the thermal conductivity of pure water at different temperatures and comparing our results with previously published work.

VL - 49 UR - http://www.sciencedirect.com/science/article/pii/S001793100600144X IS - 17-18 ER - TY - JOUR T1 - Characterization of the Temperature Oscillation Technique to Measure the Thermal Conductivity of Fluids JF - International Journal of Heat and Mass Transfer Y1 - 2006 A1 - Prajesh Bhattacharya A1 - S. Nara A1 - P. Vijayan A1 - Tang, T. A1 - W. Lai A1 - Patrick E. Phelan A1 - Ravi S. Prasher A1 - David W. Song A1 - J. Wang KW - Temperature oscillation technique KW - Thermal conductivity KW - thermal diffusivity AB -

The temperature oscillation technique to measure the thermal diffusivity of a fluid consists of filling a cylindrical volume with the fluid, applying an oscillating temperature boundary condition at the two ends of the cylinder, measuring the amplitude and phase of the temperature oscillation at any point inside the cylinder, and finally calculating the fluid thermal diffusivity from the amplitude and phase values of the temperature oscillations at the ends and at the point inside the cylinder. Although this experimental technique was introduced by Santucci and co-workers nearly two decades ago, its application is still limited, perhaps because of the perceived difficulties in obtaining accurate results. Here, we attempt to clarify this approach by first estimating the maximum size of the liquid’s cylindrical volume, performing a systematic series of experiments to find the allowable amplitude and frequency of the imposed temperature oscillations, and then validating our experimental setup and the characterization method by measuring the thermal conductivity of pure water at different temperatures and comparing our results with previously published work.

VL - 49 UR - http://www.sciencedirect.com/science/article/pii/S001793100600144X IS - 17-18 ER - TY - CONF T1 - Effect of Particle Material on the Static Thermal Conductivity of Nanofluids T2 - Heat Transfer Conference Y1 - 2005 A1 - P. Vijayan A1 - Prajesh Bhattacharya A1 - S. Nara A1 - W. Lai A1 - Patrick E. Phelan A1 - Ravi S. Prasher A1 - David W. Song A1 - J. Wang JF - Heat Transfer Conference CY - San Francisco, CA ER - TY - CONF T1 - Experimental Determination of the Effect of Varying Base Fluid and Temperature on the Static Thermal Conductivity of Nanofluids T2 - ASME International Mechanical Engineering Congress and Exposition, November 5-11, 2005 Y1 - 2005 A1 - S. Nara A1 - Prajesh Bhattacharya A1 - P. Vijayan A1 - W. Lai A1 - W. Rosenthal A1 - Patrick E. Phelan A1 - Ravi S. Prasher A1 - David W. Song A1 - Jinlin Wang AB -

The heat transfer abilities of fluids can be improved by adding small particles of sizes of the order of nanometers. Recently a lot of research has been done in evaluating the thermal conductivity of nanofluids using various nanoparticles. In our present work we address this issue by conducting a series of experiments to determine the effective thermal conductivity of alumina-nanofluids by varying the base fluid with water and antifreeze liquids like ethylene glycol and propylene glycol. Temperature oscillation method is used to find the thermal conductivity of the nanofluid. The results show the thermal conductivity enhancement of nanofluids depends on viscosity of the base fluid. Finally the results are validated with a recently proposed theoretical model.

JF - ASME International Mechanical Engineering Congress and Exposition, November 5-11, 2005 PB - ASME CY - Orlando, FL SN - 0-7918-4221-5 ER -