Derrick I. Ko
Bio: Derrick I. Ko is an academic researcher from University of Maryland, College Park. The author has contributed to research in topics: Dissipation & Turbulence kinetic energy. The author has an hindex of 2, co-authored 2 publications receiving 66 citations.
TL;DR: A comprehensive survey of the literature in the area of numerical heat transfer (NHT) published between 2000 and 2009 has been conducted by as mentioned in this paper, where the authors conducted a comprehensive survey.
Abstract: A comprehensive survey of the literature in the area of numerical heat transfer (NHT) published between 2000 and 2009 has been conducted Due to the immenseness of the literature volume, the survey
TL;DR: In this paper, the flow and power characteristics of a two-stage inline axial flow rotor-stator mixer have been investigated via CFD simulation of the RANS equations.
Abstract: Flow and power characteristics of a two-stage inline axial flow rotor-stator mixer have been investigated via CFD simulation of the RANS equations. The realizable k–e turbulence model with enhanced wall treatment was used to predict the mean velocity field, turbulent kinetic energy, and energy dissipation rate, as well as flow and power number. The results from different computational meshes are compared. The periodic behavior of throughput and torque is attributed to rotor position and shown to be related to number of blades and stator slots. The flow, power number, and energy dissipated in different fluid regions are reported for various backpressure operating conditions.
01 Jan 2003
TL;DR: In this paper, an analytical solution of the problem of diffusional mass transport inside a spherical binary mixture droplet is presented, where the droplet evaporates according to the d2-law.
Abstract: An analytical solution of the problem of diffusional mass transport inside a spherical binary mixture droplet is presented. The droplet evaporates according to the d2-law. Mass fraction profiles of the mixture components are obtained as series expansions in confluent hypergeometric, Legendre and sine/cosine functions. The analytical description is valid for arbitrary ratio of the rate of shrinkage of the sphere surface to the diffusion coefficient in the liquid phase. The results allow for a prediction of the morphology of the dried particles, i.e., whether hollow or solid spheres result from the drying process. The field of application of the results presented is spray drying of solutions of solid substances.
TL;DR: Significant growth is observed in scientific production particularly in the period from 2000–2015, and the countries that became evident as most productive on a scientific basis are the United States, Germany and China.
Abstract: Extensive analyses of technological developments and technology foresight studies have been vital to help prepare possible scientific scenarios for the future. The primary purpose of this type of foresight study is to utilise methods and attempt to assess development trends in science and technology. This paper presents an approach to find out the various trends in scientific studies in the field of drying brick/tile that are occurring in the world. All documents used in this study were obtained from the Scopus database. To shed light on drying trends, both bibliometric and network analyses were conducted in this research. For the bibliometric analysis, the Scopus database was systematically searched to obtain a dataset in relation to the drying of brick/tile. The year range covered from 1980 to 2015. On the other hand, the patent data used in the study were taken from the Espacenet international patent database. The same keywords coupled with bibliometric analysis were used to find the relevant patent data. Some parameters were considered, such as the number of documents, authorship and ownership, patterns of international collaborations, address, and number of times cited. The collaboration networks with co-citation analysis for authors were also analysed in this study. Significant growth is observed in scientific production particularly in the period from 2000–2015. The countries that became evident as most productive on a scientific basis are the United States, Germany and China.
••01 Jan 2004
TL;DR: In this paper, a finite-volume-based computational study of steady laminar forced convection inside a square cavity with inlet and outlet ports is presented, where the widths of the ports are equal to 5, 15 and 25 percent of the side.
Abstract: A finite-volume-based computational study of steady laminar forced convection inside a square cavity with inlet and outlet ports is presented. Given a fixed position of the inlet port, the location of outlet port is varied along the four walls of the cavity. The widths of the ports are equal to 5, 15 and 25 percent of the side. By positioning the outlet ports at 9 locations on the walls for Re = 10, 40, 100 and 500 and Pr = 5, a total of 101 cases were studied. For high Re and with the shortest distance between the inlet and outlet ports along the top wall, a primary CW rotating vortex that covers about 70 to 80 percent of the cavity is observed. Similar cases with smaller Re exhibit identical flow patterns but with weaker vortices as Re is lowered. As the outlet ports is lowered along the right wall, the CW primary vortex diminishes its strength; however a CCW vortex that is present next to the top right corner covers a greater portion of the cavity. With the outlet port moving left along the bottom wall, the CW primary vortex is weakened further and the CCW vortex occupies nearly the right half of the cavity. The temperature fields are directly related to the presence of the multiple vortices in the cavity. Regions of high temperature gradient are consistently observed at the interface of the throughflow and next to the solid walls on both sides of the outlet port. Local Nusselt numbers are low at 3 corners when no outlet port is present in their vicinity, whereas intense heat transfer rate is observed on the two sides of the outlet port. Between these minima and maxima, the local Nusselt number can vary drastically depending on the flow and temperature fields. By placing the outlet port with one end at the 3 corners, maximum total Nusselt number of the cavity can be achieved. Minimum total heat transfer of the cavity is achieved with the outlet port located at the middle of the walls.Copyright © 2004 by ASME
TL;DR: In this article, the authors reviewed the performance of high shear mixers (HSMs) and found that there is a significant influence of stator geometry on the uniform size distribution as well as energy dissipation.
Abstract: Dispersion of liquids/particles is a key important requirement in a variety of applications including coatings and paints, cosmetics, healthcare, food, and pharmaceutical processes. In all these industrial processes high intensity of energy is required to overcome the adhesion forces or increasing interfacial surface area per unit volume, which is achieved by high-pressure homogenizers, ultrasonic-assisted devices, and high shear mixers (HSMs). In this paper, HSMs are critically reviewed based on their design and development, and applications (such as dispersion of nanoparticles, emulsification, and mixing) in recent years. HSMs are comprised of rotational (rotor) and stationary (stator) parts with a small gap in between. It is found that there is a significant influence of stator geometry on the uniform size distribution as well as energy dissipation. Though there is extensive work on hydrodynamics and mixing in HSMs are available however, still there is no specific scale-up/down criterion is available for HSMs.
TL;DR: A comprehensive survey of the literature in the area of numerical heat transfer (NHT) published in 2010 and 2011 has been conducted as mentioned in this paper, which can be used as a starting point for future work.
Abstract: Here a comprehensive survey of the literature in the area of numerical heat transfer (NHT) published in 2010 and 2011 has been conducted. Due to the immenseness of the literature volume, journals s...