Journal•ISSN: 1759-3093
International Journal of Micro-nano Scale Transport
CLOCKSS Archive
About: International Journal of Micro-nano Scale Transport is an academic journal. The journal publishes majorly in the area(s): Heat transfer & Nanofluid. Over the lifetime, 66 publications have been published receiving 569 citations.
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TL;DR: A review of the physical mechanisms proposed to explain the thermal conductivity of nanofluids is presented in this article, where the authors discuss some controversial issues such as data inconsistencies, the sufficiency and suitability of classical and new mechanisms, and the discrepancies between experimental data and model predictions.
Abstract: Numerous studies have shown that nanofluids have superb physical properties, among which thermal conductivity has been studied most extensively but remains controversial. In this review article, we first present important milestones in experimental studies that show new features of the thermal conductivity of nanofluids, together with those that show no such special features. After a brief review of the physical mechanisms proposed to explain the thermal conductivity of nanofluids we present a critical review of the classical and new models used to predict the thermal conductivity behavior of nanofluids. We discuss some controversial issues such as data inconsistencies, the sufficiency and suitability of classical and new mechanisms, and the discrepancies between experimental data and model predictions. At the end of our review, we give some directions for future research in nanofluids and to aid researchers in resolving the controversial issues we are still facing in developing nanofluids with superior t...
216 citations
TL;DR: A review of gas flow in microchannels of different cross-sections is presented in this paper, where the phenomenon of slip, slip models and measurement of slip coefficient are first discussed, and the effect of surface roughness on flow characteristics and overall pressure drop is given due attention.
Abstract: A review of gas flow in microchannels of different cross-sections is presented in this article. The phenomenon of slip, slip models and measurement of slip coefficient are first discussed. The planar microchannels are dealt with in great detail; the different analytical, experimental and simulation approaches and solutions available in the literature are reviewed. A review of literature on square, rectangular and circular microchannels have revealed that these microchannels have also been extensively studied. Information on other shapes of microchannels such as triangular, trapezoidal and elliptical is also presented. It is recognized that surface roughness may play an important role; therefore the effect of surface roughness on flow characteristics and overall pressure drop is given due attention. It is further recognized that frequently the microchannels may not be straight; therefore, microchannels with bends or involving sudden expansion/contraction is considered. Empirical correlations and equations ...
89 citations
TL;DR: In this article, the pitch and diameter of the nanowires were fixed, and the height was varied between 1 and 8 μm, and it was observed that copper nanowire surfaces increase the critical heat flux and reduce the incipience superheat compared to the baseline experiments, which were performed using a plain surface without nano-connections.
Abstract: Copper nanowire arrays on a silicon (Si) substrate were fabricated by electro-chemical deposition through an anodic aluminum oxide (AAO) template to generate a high performance boiling surface. In this study, the pitch (~300 nm) and diameter (~200 nm) of the nanowires were fixed, and the height was varied between 1 and 8 μm. It is observed that copper nanowire surfaces increase the critical heat flux and reduce the incipience superheat compared to the baseline experiments, which were performed using a plain surface without nanowires. The work reported here is a major enhancement over previous studies on structured surfaces, which mainly considered structures which were on the order of 100 μm.
76 citations
TL;DR: This work presents a microfluidic device capable of generating stable concentration gradients in a 3D matrix, while allowing for direct imaging of cellular behavior.
Abstract: Microfluidic technology enables the creation of well-defined cell culture environments, which integrate the control of multiple biophysical and biochemical cues for designing novel in vitro assays. Growth-factor concentration gradients play a critical role in a wide range of biological processes ranging from development to cancer, guiding cell migration and influencing cell signaling. We present a microfluidic device capable of generating stable concentration gradients in a 3D matrix, while allowing for direct imaging of cellular behavior. The design consists of polydimethylsiloxane microchannels interconnected through 3D matrices. Optical access of the 3D matrix permits direct observation of invasive properties of cells seeded inside the channels or embedded in the matrix. An important characteristic of the microfluidic platform is the capability to generate reproducible, stable and quantifiable concentration gradients that are essential for systematic studies of soluble factor signaling in chemotaxis as...
40 citations
TL;DR: In this paper, an approach based on implantation of ions of dopant in a homogenous sample, overgrowth of the damaged area and annealing of radiation defects is proposed.
Abstract: We introduce an approach to decrease quantity of radiation defects in area of implanted-heterojunction rectifier. The approach based on implantation of ions of dopant in a homogenous sample, overgrowth of the damaged area and annealing of radiation defects. In this situation under spatial conditions one can obtain decreasing of quantity of radiation defects.
23 citations