Advanced Cooling Technologies and Applications

Since conventional cooling techniques are increasing falling short of meeting the ever-growing cooling demands of high heat generating devices, thermal systems, and processes, advanced and innovative cooling technologies are of immense importance to deal with such high thermal management. Hence, this book covers a number of key topics related to advanced cooling approaches, their performance, and applications, including: Evaporative air cooling; Spray impingement cooling; Heat pump-based cooling; Modular cooling for photovoltaic plant; Nucleate pool boiling of refrigerants; Transient flashing spray cooling and application; Compressor cooling systems for industry. The book is aimed at a wide variety of people from graduate students and researchers to manufacturers who are involved or interested in the areas of thermal management systems, cooling technologies, and their applications

Heat Transfer and Fluids Properties of Nanofluids

As it is popular research field, extensive research has been performed in various areas of nanofluids, and most of the studies have demonstrated significant enhancements in their thermophysical properties and thermal transport performance compared to those of conventional thermal fluids. However, there have been unanimous conclusions regarding such enhancements and their underlying mechanisms. Nanofluids’ potential and thermal applications mainly depend on their convective and boiling heat transfer performances, which are also not unbiased in the literature. On top of this, a major challenge with nanofluids is obtaining sustainable stability and persistent properties over a long duration. All these issues are very crucial for nanofluids’ development and applications, and a lot of research in these areas has been conducted in recent years. Thus, this Special Issue, featuring a dozen of high-quality research and reviews on different types of nanofluids and their important topics related to thermophysical and electrical properties as well as convective and boiling heat transfer characteristics, is of great significance for the progress and real-world applications of this new class of fluids

Nanofluids and Nanofluidics

Both nanofluids and nanofluidics are popular research fields that have attracted tremendous research interest in recent years [...

Brownian Motion-Based Model For Enhanced Thermal Conductivity Of Nanofluids

Nanofluids are a new class of heat transfer fluids which are engineered by dispersing nanometer-sized solid particles in conventional fluids. This is a rapidly emerging interdisciplinary field where nanoscience, nanotechnology, and thermal engineering meet. Since the novel concept of nanofluids was coined in 1995, this research topic has attracted tremendous interest from researchers worldwide due to their exciting thermal properties and potential applications in numerous important fields. Although research works have shown that nanofluids exhibit significantly higher thermal conductivity compared to their base fluids, the underlying mechanisms for the enhancement are still debated and not thoroughly understood. Despite considerable theoretical efforts devoted to the development of model for the prediction of the effective thermal conductivity of nanofluids, there has been little agreement among different studies and no widely accepted model is also available due to inconclusive heat transfer mechanisms of nanofluids. Nevertheless, fundamental understanding of the underlying mechanisms and development of a unanimous theoretical model are crucial for exploiting potential benefits and applications of nanofluids. In this chapter, a new and improved Brownian motion-based model is introduced for the prediction of the enhanced thermal conductivity of nanofluids. In addition to the Brownian motion of nanoparticles, this model also takes into account several other important factors such as particle size and interfacial nanolayer that contribute to the enhancement of the effective thermal conductivity of nanofluids. The conventional kinetic theory-based Brownian motion term has been renovated using effective diffusion coefficient concept. The present model shows reasonably good agreement with the experimental results of various aqueous nanofluids and gives better predictions compared to classical and other recently developed models. Besides providing a brief review on theoretical studies and various heat transfer mechanisms of nanofluids, details of the present model development and its validation with the experimental results are also discussed in this chapter. © 2012 by Nova Science Publishers, Inc. All rights reserved