Anthony M. Jacobi

Bio: Anthony M. Jacobi is an academic researcher from University of Illinois at Urbana–Champaign. The author has contributed to research in topics: Heat transfer & Heat exchanger. The author has an hindex of 49, co-authored 273 publications receiving 9255 citations. Previous affiliations of Anthony M. Jacobi include Johns Hopkins University & Purdue University.

Wettability Change by Pool Boiling of Nanofluids and Its Impact on Heat Transfer

Abstract: In refrigeration and air-conditioning systems, evaporator performance can be enhanced by avoiding dry-out of the tube wall. There are a myriad of other multiphase systems that can benefit from enhanced surface wetting. Using nanofluid boiling nanoparticle deposition (NBND), surface wettability can be enhanced significantly due to the formation of a porous layer that modifies liquid spreading. This paper will present an investigation of surfaces modified by nanofluid boiling using various types of aqueous aluminum oxide nanofluids nanofluids. Scanning ElectronicMicroscopy (SEM) images show the growth of aluminum oxide hydroxide on the aluminum substrate, which enhances affinity with water, and the micro-structures introduced by nanoparticle deposition. Atomic Force Microscopy (AFM) reveals the physics of the wettability enhancement by NBND on ultra-smooth substrates, which is described by Wenzel’s wetting model. The impact of this change in wettability on boiling heat transfer will also be discussed with data from pool boiling experiment. These results will guide the design of nanoporous superhydrophilic coatings to enhance heat transfer from a surface science point of view.

Numerical Simulation (CFD) to Explore Optimal Vortex Generator Array Configurations in Air Cooled Condensers

Abstract: This study presents a numerical analysis of laminar convective heat transfer in a rectangular channel with an array of delta-winglet vortex generators (VG) and with one straight line of multiple VGs. A low and high Reynolds number case of 225 and 1123 is simulated which is representative of the lower and upper limits of the air velocity range in a typical air cooled condenser (ACC) system. The effects of interacting and non-interacting vortices on the Nusselt number and pressure drop are observed for the two Reynolds numbers. The low Re cases flow cleaner through the channel, pressure drop is slightly lower for the array in comparison to the straight line formation for two VG pairs, however the increase in Nusselt number is higher in the straight line configuration. For the high Re cases the vortices generated are stronger and persist longer and interactions between vortices in the array configuration lead to Nusselt number increase but a higher pressure drop increase. The straight line configuration has almost equal increase in Nusselt number and pressure drop.

Flow and heat transfer in louvered and offset-strip fin arrays: the effects of vortex shedding and boundary-layer re-starting

Abstract: Data from offset-strip and louvered fins are used to explore vortex shedding and boundary-layer re-starting effects on heat exchanger performance. Both mechanisms are important to offset-strips, but only boundary-layer effects are important to louvers. The shedding structure in irregular arrays vitiates the expected heat transfer impact. Unless the effects of array regularity on vortex structure are understood, strategies for enhancing offset-strip fin arrays should focus on shedding, and louver enhancements should exploit boundary-layer thinning.

Surface and Colloid Science

Abstract: 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.

Pedagogies of Engagement: Classroom-Based Practices

Abstract: 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.

Luminescent probes and sensors for temperature.

Abstract: 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.