Thermal conductivity of carbon nanotubes and their polymer nanocomposites: A review

1: Magnetic Particles: Preparation, Properties and Applications: M. Ozaki. 2: Maghemite (gamma-Fe2O3): A Versatile Magnetic Colloidal Material C.J. Serna, M.P. Morales. 3: Dynamics of Adsorption and Oxidation of Organic Molecules on Illuminated Titanium Dioxide Particles Immersed in Water M.A. Blesa, R.J. Candal, S.A. Bilmes. 4: Colloidal Aggregation in Two-Dimensions A. Moncho-Jorda, F. Martinez-Lopez, M.A. Cabrerizo-Vilchez, R. Hidalgo Alvarez, M. Quesada-PMerez. 5: Kinetics of Particle and Protein Adsorption Z. Adamczyk.

Surface and Colloid Science

Fast Fourier Transform

Educators, researchers, and policy makers have advocated student involvement for some time as an essential aspect of meaningful learning. In the past twenty years engineering educators have implemented several means of better engaging their undergraduate students, including active and cooperative learning, learning communities, service learning, cooperative education, inquiry and problem-based learning, and team projects. This paper focuses on classroom-based pedagogies of engagement, particularly cooperative and problem-based learning. It includes a brief history, theoretical roots, research support, summary of practices, and suggestions for redesigning engineering classes and programs to include more student engagement. The paper also lays out the research ahead for advancing pedagogies aimed at more fully enhancing students’ involvement in their learning.

/pdf/pedagogies-of-engagement-classroom-based-practices-5cfm8gf709.pdf

Pedagogies of Engagement: Classroom-Based Practices

Temperature (T) is probably the most fundamental parameter in all kinds of science. Respective sensors are widely used in daily life. Besides conventional thermometers, optical sensors are considered to be attractive alternatives for sensing and on-line monitoring of T. This Review article focuses on all kinds of luminescent probes and sensors for measurement of T, and summarizes the recent progress in their design and application formats. The introduction covers the importance of optical probes for T, the origin of their T-dependent spectra, and the various detection modes. This is followed by a survey on (a) molecular probes, (b) nanomaterials, and (c) bulk materials for sensing T. This section will be completed by a discussion of (d) polymeric matrices for immobilizing T-sensitive probes and (e) an overview of the various application formats of T-sensors. The review ends with a discussion on the prospects, challenges, and new directions in the design of optical T-sensitive probes and sensors.

Luminescent probes and sensors for temperature.

The effect of condensate retention on the air-side heat transfer and pressure drop performance of automotive evaporator coils was studied. Experiments under wet and dry conditions were conducted using offsetstrip and louver-fin heat exchangers. Condensate retention and thermal-hydraulic data were collected at steady-state to quantitatively determine how condensate accumulates and affects the heat exchanger surface. The amount of condensate retention and the thermal hydraulic performance were found to depend on fm pitch, louver pitch, louver width, fin width and contact angles.

Air-Side Heat Transfer with Highly Interrupted Surfaces: An Experimental Study of Condensate Retention Effects

PowerFlow: A Toolbox for Modeling and Simulation of Aircraft Systems

Air-Side Heat Transfer Performance of Louver Fin and Multitube Heat Exchanger for Direct Methanol Fuel Cell Cooling Application

A run-around heat exchanger system to improve the energy efficiency of a home appliance using hot water

Contemporary compact heat exchangers often employ very high fin densities. In many air-conditioning applications such as automotive cooling, the heat exchanger operates to dehumidify the conditioned air. It has been observed that the amount of condensate retained on the air-side surface significantly increases with increased fin density. Retained condensate not only affects the thermal-hydraulic performance, but it also has adverse implications on the quality of conditioned air. Conventional wind tunnel experiments to assess performance are expensive. A method for characterizing water drainage from heat exchanger surfaces, the so-called dynamic dip test, is described. The dynamic dip test is explored as a fast and efficient method for comparative and screening studies for applications where off-cycle drainage is important. Results from more than 30 automotive-style heat exchangers are presented, and condensate drainage characteristics are explored to assess surface tension effects in inter-fin and louver gaps of highfin-density, compact heat exchangers.

/pdf/assessing-the-condensate-drainage-behavior-of-dehumidifying-1v63ljuc1a.pdf

Anthony M. Jacobi

Papers

Air-Side Heat Transfer with Highly Interrupted Surfaces: An Experimental Study of Condensate Retention Effects

PowerFlow: A Toolbox for Modeling and Simulation of Aircraft Systems

Air-Side Heat Transfer Performance of Louver Fin and Multitube Heat Exchanger for Direct Methanol Fuel Cell Cooling Application

A run-around heat exchanger system to improve the energy efficiency of a home appliance using hot water

Assessing the condensate-drainage behavior of dehumidifying heat exchangers