Relevant bibliographies by topics / Microchannel

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Microchannel'

Author: Grafiati
Published: 4 June 2021
Last updated: 29 March 2025

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Journal articles on the topic "Microchannel"

1

Hurtado-Venegas, Ignacio, Víctor A. Martínez, Vasco Diego A., Roberto Ortega-Aguilera, Paula A. Zapata, Francisco A. Cataño, and Alifhers S. Mestra. "Numerical Study About Nanofluids of Spherical and Tube-Shaped TiO2 Nanomaterials on the Thermal Performance and Entropy Generation of Different Cross-Section Microchannel Heat Sinks." Journal of Nanofluids 12, no. 1 (February 1, 2023): 65–77. http://dx.doi.org/10.1166/jon.2023.1911.

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We numerically evaluated the thermal performance of microchannel heat sinks, considering rectangular, hexagonal, and circular cross-sections. Moreover, as a passive heat transfer augmentation technique, dimples were added to improve the rectangular microchannel heat sinks. These simulations use nanofluids based on TiO2 nanoparticles or nanotubes dispersed in bidistilled water as working fluids. The mathematical model considered variable thermophysical properties of the nanofluids; for this purpose, polynomial fittings correlate the dependence of the thermophysical properties on the temperature. We considered a heat flux of q″ = 50 W/cm2 at the microchannel’s lower surface as a boundary condition along with laminar flow conditions. The numerical simulations allowed the Nusselt numbers and entropy generation calculation, which were the basis for the thermal performance calculation. Regarding the effect of TiO2 nanoparticles shape, spherical TiO2 nanoparticles based nanofluids using rectangular microchannels improve the Nusselt number. Moreover, the frictional entropy decreases with nanofluids based on TiO2 nanotubes, but the thermal entropy decreases with nanofluids based on TiO2 nanotubes. Incorporating dimples in the rectangular microchannel enhances the Nusselt numbers and lowers the entropy generation. Considering the Reynolds number range and from the perspective of Nusselt number and entropy generation, we concluded that the microchannels must be operated at a high Reynolds number to improve the microchannel heat sinks thermal performance.
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Doan, Minhhung, Thanhtrung Dang, and Xuanvien Nguyen. "The Effects of Gravity on the Pressure Drop and Heat Transfer Characteristics of Steam in Microchannels: An Experimental Study." Energies 13, no. 14 (July 11, 2020): 3575. http://dx.doi.org/10.3390/en13143575.

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Experiments were carried out to investigate the pressure drop and heat transfer behaviors of a microchannel condenser. The effects of gravity on the condensation of steam in the microchannels were investigated for both horizontal and vertical cases. For the experimental results, the pressure drop of vertical microchannels in the condenser is lower than for horizontal microchannels. In the case of the horizontal microchannel, as the mass flow rate of steam increases from 0.01 g·s−1 to 0.06 g·s−1, the pressure drop increases from 1.5 kPa to 50 kPa, respectively. While the mass flow rate of steam in the vertical microchannel case increases from 0.01 g·s−1 to 0.06 g·s−1, the pressure drop increases from 2.0 kPa to 44 kPa, respectively. This clearly indicates that the gravitational acceleration affects the pressure drop. The pressure drop of the vertical microchannel is lower than that obtained from the horizontal microchannel. In addition, the capacity of the condenser is the same in both cases. This leads to the performance index obtained from the vertical microchannel condenser being higher than that obtained from the horizontal microchannel condenser. These results are important contributions to the research on the condensation of steam in microchannels.
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Wei, Xiaojin, Yogendra Joshi, and Michael K. Patterson. "Experimental and Numerical Study of a Stacked Microchannel Heat Sink for Liquid Cooling of Microelectronic Devices." Journal of Heat Transfer 129, no. 10 (February 23, 2007): 1432–44. http://dx.doi.org/10.1115/1.2754781.

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One of the promising liquid cooling techniques for microelectronics is attaching a microchannel heat sink to, or directly fabricating microchannels on, the inactive side of the chip. A stacked microchannel heat sink integrates many layers of microchannels and manifold layers into one stack. Compared with single-layered microchannels, stacked microchannels provide larger flow passages, so that for a fixed heat load the required pressure drop is significantly reduced. Better temperature uniformity can be achieved by arranging counterflow in adjacent microchannel layers. The dedicated manifolds help to distribute coolant uniformly to microchannels. In the present work, a stacked microchannel heat sink is fabricated using silicon micromachining techniques. Thermal performance of the stacked microchannel heat sink is characterized through experimental measurements and numerical simulations. Effects of coolant flow direction, flow rate allocation among layers, and nonuniform heating are studied. Wall temperature profiles are measured using an array of nine platinum thin-film resistive temperature detectors deposited simultaneously with thin-film platinum heaters on the backside of the stacked structure. Excellent overall cooling performance (0.09°C∕Wcm2) for the stacked microchannel heat sink has been shown in the experiments. It has also been identified that over the tested flow rate range, counterflow arrangement provides better temperature uniformity, while parallel flow has the best performance in reducing the peak temperature. Conjugate heat transfer effects for stacked microchannels for different flow conditions are investigated through numerical simulations. Based on the results, some general design guidelines for stacked microchannel heat sinks are provided.
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Lin, C. M., T. C. Lin, C. M. Tan, and T. H. Tsai. "Computational Modeling of Microchannel Flows on Laboratory Compact Disk (LABCD)." Journal of Mechanics 26, no. 2 (June 2010): 239–47. http://dx.doi.org/10.1017/s1727719100003099.

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AbstractThis paper models and analyzes flows in linear and curved microchannels on a rotating Laboratory Compact Disk (LabCD). The effects of centrifugal force are introduced into the governing equations of the microchannel flow to promote the fluidic velocity in the microchannel. The microchannel types on the LabCD must be designed following a process of mathematical identification. A flow model which takes into account the combined effects of viscosity, capillary forces, pressure difference and rotation is developed. A reduction-order technique is applied to obtain linear and nonlinear governing equations for flows in straight and curviform microchannels, respectively. The analytical solutions for the flow in the tubular microchannel are obtained using the Laplace transform method, while the numerical solutions for the curviform microchannel or microchannel with a varying cross-section are obtained using a piecewise linear method. The results show that the analyzed models are easily presented by a mathematical expression for the case of a tubular microchannel and simulated using a numerical program for the case of special microchannels. The modeling presented in this paper enables the performance of LabCD devices to be significantly enhanced by providing insights into the fluid flow behavior in microchannels of varying configurations under different rotational velocities.
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Hu, Wenju, and Xin Zhang. "Study on the Coupling Effect of Heat Transfer and Refrigerant Distribution in the Flat Tube of a Microchannel Evaporator." Energies 15, no. 14 (July 20, 2022): 5252. http://dx.doi.org/10.3390/en15145252.

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Refrigerant maldistribution severely deteriorates the heat transfer performance of a microchannel evaporator. Compared with the refrigerant distribution among flat tubes along the header, refrigerant distribution among microchannels in the flat tube in the airflow direction has barely been paid attention. In this paper, a heat transfer mathematical model of a microchannel evaporator’s flat tube composed of vertically placed parallel microchannels in the airflow direction was developed. The Refrigerant distribution among the microchannels was evaluated and its influence on heat transfer between air and refrigerant was analyzed. The results showed that the refrigerant distribution and heat transfer performance between air and refrigerant were interrelated and interacted with each other. The temperature of the air leaving the microchannel evaporator changed along the microchannel because of uneven refrigerant distribution among the microchannels, and the air temperature difference between air leaving out of the bottom and the top of the evaporator was approximately 2.13 °C. Ignoring the heat transfer from adjacent microchannels will lead to a small heat transfer deviation for the flat tube; thus, heat transfer among microchannels can be neglected.
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Zhou, Shengnan, Bifen Shu, Zukang Yu, Yan Huang, and Yuqi Zhang. "Experimental Study and Mechanism Analysis of the Flow Boiling and Heat Transfer Characteristics in Microchannels with Different Surface Wettability." Micromachines 12, no. 8 (July 27, 2021): 881. http://dx.doi.org/10.3390/mi12080881.

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In this paper experiments have been conducted to investigate the flow boiling and heat transfer characteristics in microchannels with three different surface wettability. Three types of microchannels with a super-hydrophilic surface (θ ≈ 0°), a hydrophilic surface (θ = 43°) and an untreated surface (θ = 70°) were prepared. The results show that the average heat transfer coefficient of a super-hydrophilic surface microchannel is significantly higher than that of an untreated surface microchannel, especially when the mass flux is high. The visualization of the flow patterns states that the number of bubble nucleation generated in the super-hydrophilic microchannel at the beginning of the flow boiling is significantly more than that in the untreated microchannel. Through detailed analysis of the experimental data, flow patterns and microchannel surface SEM images, it can be inferred that the super-hydrophilic surface microchannel has more active nucleation cavities, a high nucleation rate and a large nucleation number, a small bubble departure diameter and a fast departure frequency, thereby promoting the flow and heat transfer in the microchannel. In addition, through the force analysis of the vapor-liquid interface, the mechanism that the super-hydrophilic microchannel without dryout under high heat flux conditions is clarified.
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Huang, ZeChen. "Current Status and Prospect of Microchannel Research." Highlights in Science, Engineering and Technology 38 (March 16, 2023): 605–11. http://dx.doi.org/10.54097/hset.v38i.5890.

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The application of microchannel in engineering field is becoming more and more extensive, which has attracted extensive attention of researchers at home and abroad. In the field of microelectronics technology, if the heat cannot be dissipated effectively, the working temperature of electronic devices will be seriously affected. Microchannel is an effective means to solve the heat dissipation problem. This paper shows the research status of microchannels by enumerating the research achievements of microchannels at home and abroad. By using the methods of literature review and comparison, four main problems of microchannel research in China are pointed out: the commercial production of microchannel. The problems caused by the application of micro channels to products, the risk of slow technological innovation is decreasing, the potential for future growth and the lack of uniform industry standards. Finally, the future development and research of microchannel are prospected, and some suggestions are put forward to provide reference for the future research and development of microchannel technology in China.
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Huang, C. Y., and J. S. Li. "Rarefaction Effect on Gas Flow in Microchannels with Various Aspect Ratios." Journal of Mechanics 33, no. 1 (July 1, 2016): N1—N6. http://dx.doi.org/10.1017/jmech.2016.62.

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AbstractThis study investigated the effect of rarefaction on microchannel gas flow by measuring pressure profiles in microchannels with various aspect ratios. Pressure-sensitive paint (PSP) was applied in rectangular microchannels to obtain the global flow field by using detailed pressure data. The effect of rarefaction on the microchannel gas flow was clearly observed in the microchannels through the pressure data obtained using PSP measurements. A nonlinear pressure distribution was observed inside the microchannels, and this distribution decreased as the Knudsen number (Kn) increased because of the rarefaction effect. The dimensionless pressure deviation from the linear assumption dropped from 0.25 to 0 when the outlet Kn number increased to 0.066 in the 100-μm-wide microchannel, and the dimensionless location of the maximum deviation moved upstream because of the gaseous slip at the wall. The nonlinear pressure distribution also decreased in the 50-μm-wide microchannel as the outlet Kn number increased; however, the peak of the maximum deviation could no longer be identified because of the characteristic of the narrow channel.
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Tyrinov, A. I. "TEMPERATURE STABILIZATION OF MICROCHANNEL FLOW." Thermophysics and Thermal Power Engineering 41, no. 1 (December 3, 2018): 20–26. http://dx.doi.org/10.31472/ttpe.1.2019.3.

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The purpose of this work is to determine the nature of the effect of the intensity of slipping the medium on the walls of the microchannel on the temperature stabilization of the flow in the microchannel. To achieve this goal, numerical simulation of the start flow in flat, round, and rectangular microchannels was performed using the Boltzmann Speech Method. The heat exchange in the initial region in flat, round and rectangular microchannels is analyzed. The influence of the fluid acceleration intensity on the stabilization of the flow temperature in the microchannel is determined.
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Yu, Guoqing, Wubin Ding, and Cheng Xu. "Research on the thermal and flow characteristics of novel microchannel PV/T collectors." Thermal Science, no. 00 (2023): 227. http://dx.doi.org/10.2298/tsci230522227y.

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A novel microchannel photovoltaic photothermal collector is investigated, comprising of photovoltaic cells and collectors. Its distinctive feature lies in the flow mode of its microchannels. The novel microchannel investigated in this study is composed of multiple drums, allowing for a non-parallel flow configuration. This distributional flow pattern facilitates enhanced contact between the water flow and the heat transfer surface, thereby resulting in significantly improved heat transfer efficiency. characteristics and flow properties are studied to enhance the thermoelectric performance and broaden the application scope of photovoltaic photothermal collector technology. This study focuses on parallel microchannels and three-passes microchannels for comparison, employing Ansys Fluent to simulate electrical and thermal efficiencies, temperature distribution, velocity field, and pressure field under typical operating conditions. The validity of the model is verified by comparing it with experimental panel surface temperature data. Within this framework, various inlet flow conditions are examined to investigate the collector's temperature profile, standard deviation of temperature distribution, pressure drops, and maximum velocity. Results indicate that under specific circumstances, the heat collection performance of parallel microchannel photovoltaic photothermal collectors is inferior to that of three-passes microchannel counterparts. Both types exhibit reduced efficiency during winter conditions; however, three-passes microchannels experience a more significant decline at 22.4%, compared to 19.7% for parallel microchannels. In terms of flow resistance characteristics, parallel microchannels demonstrate advantages in terms of pressure drops over three-passes configurations as they exhibit nearly 3935 Pa lower values under certain conditions. Regarding temperature uniformity in photovoltaic-photothermal systems, parallel microchannel collectors outperform their three-passes counterparts.
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Dissertations / Theses on the topic "Microchannel"

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Price, Gareth James. "Microchannel plates in astronomy." Thesis, University of Leicester, 2001. http://hdl.handle.net/2381/8638.

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This thesis describes both round-pore microchannel plates (MCPs) used in energetic pho¬ton and particle detectors and their square-pore offspring, micropore optics (MPOs), used to focus x-rays. A Monte Carlo electron raytracing software package is described that is used to predict the energy and angular distribution of electrons (EDOE and ADOE) in a microchannel electron multiplier's output charge cloud, including saturated operation. The model is shown to agree with experimental evidence. The addition of a micromachined electrostatic lens to the end of a microchannel is modelled and found to have no beneficial effects upon the EDOE and ADOE of the channel. The current state of the art planar and slumped 'lobster eye' square-packed MPOs are evaluated. The best focus (5' FWHM) from a large format (61mm x 56mm), small chan¬nel (10μm side length) planar MPO is reported, together with the observation of high energy (~50keV →65keV) x-ray focusing from large (500:1) aspect ratio channels. The alignment of many small lobster eye MPOs to create a large optic for the Lobster-ISS instrument is discussed and the alignment jig constructed for this purpose is used to measure the bias angles of a Lobster specification MPO. The bias angle is found to be 4 ± 1.5'. The concept of the microchannel conic approximation to the Wolter type I and II x- ray lenses is reviewed. A radially-packed twin MPO Wolter approximation is then tested, which while of poor quality, demonstrates true Wolter II imaging with a peak gain greater than unity. Currently proposed (UK) astronomical instruments that employ MPOs are then discussed in the light of the results from the current generation of MPOs.
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Checketts, Gus Thomas. "Microchannel Radiator: an Investigation of Microchannel Technology with Applications in Automotive Radiator Heat Exchangers." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc700005/.

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Microchannels have been used in electronics cooling and in air conditioning applications as condensers. Little study has been made in the application of microchannels in automotive heat exchangers, particularly the radiator. The presented research captures the need for the design improvement of radiator heat exchangers in heavy-duty vehicles in order to reduce aerodynamic drag and improve fuel economy. A method for analyzing an existing radiator is set forth including the needed parameters for effective comparisons of alternative designs. An investigation of microchannels was presented and it was determined that microchannels can improve the overall heat transfer of a radiator but this alone will not decrease the dimensions of the radiator. Investigations into improving the air-side heat transfer were considered and an improved fin design was found which allows a reduction in frontal area while maintaining heat transfer. The overall heat transfer of the design was improved from the original design by 7% well as 52% decrease in frontal area but at the cost of 300% increase in auxiliary power. The energy saved by a reduction in frontal area is not substantial enough to justify the increase of auxiliary power. The findings were verified through a computational fluid dynamic model to demonstrate the heat transfer and pressure drop of microchannel tubes. The results confirmed that heat transfer of microchannels does improve the thermal performance of the radiator but the pressure drop is such that the net benefit does not outweigh the operating cost. An additional CFD study of the new fin geometry and air-side heat transfer predictions was conducted. The results of the study confirmed the theoretical calculations for the fin geometry.
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Benoit, Vincent. "Flow-through microchannel DNA chips." Thesis, University of Glasgow, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368731.

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Martin, Adrian Peter. "Exploitation of microchannel plate optics." Thesis, University of Leicester, 2000. http://hdl.handle.net/2381/30635.

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This thesis contains work on microchannel plate (MCP) optics as used for X-ray focusing, and can be split into two sections; research and applications.;Research into improving the reflectivity of MCPs is presented which includes results obtained at the Daresbury Synchrotron, and electron microscope analysis. Different treatments performed on Nova Scientific channel plates were shown only to make a improvement to reflectivity in the case of annealing. Evidence for a 300A layer of silica on the surfaces of the microchannels, a result of the acid etching process, was discovered.;The method of bending, or slumping MCPs to a spherical form by Photonis and Nova has been assessed, and X-ray images using slumped plates are presented. The accuracy and reproducibility of the process was not found to be excellent (within 10% of the target radius), but were acceptable for the plates slumped to date.;A comprehensive report is given of the application of channel plates as the imaging device in an Imaging X-ray Fluorescence Spectrometer, firstly at the Rutherford Appleton Laboratory and subsequently in the laboratory in Leicester. The spectrometer successfully imaged a multi-element target, resolving both elementally (down to Fluorine, Z=9) and spatially (to under 2mm) in a 34 hour integration. The concept of Bragg reflection imaging is examined as another use of the spectrometer.
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Siu, Billy Chin Pang. "Condensation heat transfer in microchannel /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?MECH%202004%20SIU.

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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2004.
Includes bibliographical references (leaves 43-46). Also available in electronic version. Access restricted to campus users.
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Mehrotra, Rajat. "Monodispersed polygonal water droplets in microchannel." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2726.

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Burg, Thomas P. (Thomas Peter). "Suspended microchannel resonators for biomolecular detection." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/34471.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.
Includes bibliographical references (leaves 115-124).
Microfabricated transducers enable the label-free detection of biological molecules in nanoliter sized samples. Integrating microfluidic detection and sample-preparation can greatly leverage experimental efforts in systems biology and pharmaceutical research by increasing analysis throughput while dramatically reducing reagent cost. Microfabricated resonant mass sensors are among the most sensitive devices for chemical detection, but degradation of the sensitivity in liquid has so far hindered their successful application in biology. This thesis introduces a type of resonant transducer that overcomes this limitation by a new device design: Adsorption of molecules to the inside walls of a suspended microfluidic channel is detected by measuring the change in mechanical resonance frequency of the channel. In contrast to resonant mass sensors submersed in water, the sensitivity and frequency resolution of the suspended microchannel resonator is not degraded by the presence of the fluid. Our device differs from a vibrating tube densitometer in that the channel is very thin, and only molecules that bind to the walls can build up enough mass to be detected; this provides a path to specificity via molecular recognition by immobilized receptors.
(cont.) Suspended silicon nitride channels have been fabricated through a sacrificial polysilicon process and bulk micromachining, and the packaging and microfluidic interfacing of the resonant sensors has been addressed. Device characterization at 30 mTorr ambient pressure reveals a quality factor of more than 10,000 for water filled resonators; this is two orders of magnitude higher than previously demonstrated Q-values of resonant mass sensors for biological measurements. Calculation of the noise and the sensitivity of suspended microchannel resonators indicate a physical limit for mass resolution of approximately 0.01 ng/cm2 (1 Hz bandwidth). A resolution of -0.1 ng/cm2 has been experimentally demonstrated in this work. This resolution constitutes a tenfold improvement over commercial quartz crystal microbalance based instruments. The ability to detect adsorbing biomolecules by resonance frequency has been validated through binding experiments with avidin and various biotinylated proteins.
by Thomas P. Burg.
Ph.D.
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Parak, Muhammad. "Development of a microchannel reactor model." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/11615.

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Includes abstract.
Includes bibliographical references (p. 151-157).
The development and future wide-spread use of hydrogen fuel cells is inhibited by problems associated with hydrogen storage. A possible alternative is to store and then reform hydrocarbons to yield hydrogen in an on-board fuel processing system. Microchannel reactors have reduced mass and heat transfer limitations and are able to exploit fast intrinsic kinetics. Also, their high surface area to volume ratio reduces their size for a constant throughput, increasing their potential for miniaturised deployment. Current microchannel reactor models are either over simplified and neglect important subtleties, or too complex and are not usable for optimisation or sensitivity studies. The objective of this project is to develop a comprehensive model that obeys the phenomenological laws and is fast enough to be used for optimisation.
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Fogg, David W. "Bubble dynamics in microchannel flow boiling /." May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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Dagle, Robert Alexander. "Fuel processing catalysis for microchannel applications." Online access for everyone, 2005. http://www.dissertations.wsu.edu/Thesis/Spring2005/r%5Fdagle%5F050305.pdf.

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Books on the topic "Microchannel"

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Zhang, Lian, Kenneth E. Goodson, and Thomas W. Kenny. Silicon Microchannel Heat Sinks. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-09899-8.

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Ohadi, Michael, Kyosung Choo, Serguei Dessiatoun, and Edvin Cetegen. Next Generation Microchannel Heat Exchangers. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-0779-9.

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Ohadi, Michael. Next Generation Microchannel Heat Exchangers. New York, NY: Springer New York, 2013.

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W, Siegmund Oswald H., and United States. National Aeronautics and Space Administration., eds. Performance of small pore microchannel plates. [Washington, DC: National Aeronautics and Space Administration, 1997.

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Zhang, Lian. Silicon Microchannel Heat Sinks: Theories and Phenomena. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004.

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6

Andrew, Chen, and United States. National Aeronautics and Space Administration., eds. Development of microchannel plate x-ray optics. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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United States. National Aeronautics and Space Administration., ed. A new approach to large area microchannel plate manufacture. [Washington, DC: National Aeronautics and Space Administration, 1986.

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8

Odukoya, A. Thermocapillary pumping of a droplet in a closed microchannel. [New York]: Knovel, 2011.

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Chen, Lin. Microchannel Flow Dynamics and Heat Transfer of Near-Critical Fluid. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-2784-0.

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Kaaret, Philip E. Development of microchannel plate x-ray optics: Annual status report for NAGW-2721, 1 July 1993 - 30 June 1994. [Washington, D.C.]: National Aeronautics and Space Administration, 1994.

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Book chapters on the topic "Microchannel"

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Vladisavljevic, Goran, Isao Kobayashi, and Mitsutoshi Nakajima. "Microchannel Emulsification." In Encyclopedia of Membranes, 1–3. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-40872-4_383-22.

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Dang, Khanh, David W. G. Morrison, Utkan Demirci, and Ali Khademhosseini. "Plasma in Microchannel." In Encyclopedia of Microfluidics and Nanofluidics, 2781–89. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-5491-5_1252.

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Luo, Win-Jet, and Ruey-Jen Yang. "Curved Microchannel Flow." In Encyclopedia of Microfluidics and Nanofluidics, 520–27. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-5491-5_289.

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Mauro, Carlino, Gill L. Buchanan, and Godino Cosmo. "The microchannel technique." In Chronic Total Occlusions, 166–71. Oxford: John Wiley & Sons, 2013. http://dx.doi.org/10.1002/9781118542446.ch24.

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Dang, Khanh, David W. G. Morrison, Utkan Demirci, and Ali Khademhosseini. "Plasma in Microchannel." In Encyclopedia of Microfluidics and Nanofluidics, 1–10. Boston, MA: Springer US, 2014. http://dx.doi.org/10.1007/978-3-642-27758-0_1252-2.

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Luo, Win-Jet, and Ruey-Jen Yang. "Curved Microchannel Flow." In Encyclopedia of Microfluidics and Nanofluidics, 1–10. Boston, MA: Springer US, 2013. http://dx.doi.org/10.1007/978-3-642-27758-0_289-3.

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Ali, Hafiz Muhammad, Ali Hassan, and Abdul Wahab. "Microchannel Heat Exchanger." In Nanofluids for Heat Exchangers, 99–105. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-3227-4_4.

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Yap, Y. F., Yali Zhang, Teck Neng Wong, Nam-Trung Nguyen, and John C. Chai. "Flow Bifurcation in Microchannel." In Encyclopedia of Microfluidics and Nanofluidics, 1120–31. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-5491-5_539.

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Yap, Y. F., Yali Zhang, Teck Neng Wong, Nam-Trung Nguyen, and John C. Chai. "Flow Bifurcation in Microchannel." In Encyclopedia of Microfluidics and Nanofluidics, 1–13. Boston, MA: Springer US, 2014. http://dx.doi.org/10.1007/978-3-642-27758-0_539-2.

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Ohadi, Michael, Kyosung Choo, Serguei Dessiatoun, and Edvin Cetegen. "Fundamentals of Microchannels." In Next Generation Microchannel Heat Exchangers, 1–32. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-0779-9_1.

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Conference papers on the topic "Microchannel"

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Barrot, Christine, and Ste´phane Colin. "Electroosmotic Flow in Tree-Shaped Microchannel Networks." In ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2008. http://dx.doi.org/10.1115/icnmm2008-62073.

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An analytical model of electroosmotic flow in tree-shaped microchannel networks is developed. The aim of the study is to determine the best network architecture to maximize the electroosmotic flowrate for a given electric field and a given total microchannel volume. The network consists of rectangular microchannels with high aspect ratio. The paper shows under what conditions the tree structure offers a higher flowrate than a series of parallel microchannels. The influence of the electric double layer (EDL) thickness is pointed out. As long as the EDL thickness is negligible compared with the microchannel width, the tree-shaped architecture does not present any particular interest. But as soon as the EDL thickness is significant, it is shown that the flowrate can be largely enhanced by increasing the number of bifurcations in the tree-shaped network. Two configurations of bifurcations (V-shaped and U-shaped) are considered and compared. Each bifurcation is composed of a parent microchannel connected to two identical daughter microchannels. The optimal value of the daughter over parent microchannels widths is calculated. The influence of the daughter over parent microchannels lengths and of the number of bifurcations is pointed out. Guidelines for the design of tree-shaped microchannel networks are finally proposed.
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Pan, Minqiang, Yong Tang, Yihong Zhang, and Wei Zhou. "Modelling of Flow Uniformity Among Non-Uniform Cross-Section Microchannels." In 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2007. http://dx.doi.org/10.1115/mnc2007-21379.

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A model of non-uniform cross-section microchannels for realizing flow uniformity is developed in this work. For easy fabrication of microchannels, only the microchannel widths are changed while the thicknesses remain unchangeable in this model, and the relation of the widths of two adjacent microchannels has been established. A specific case is illustrated to study the influence of structural parameters on the microchannel widths. Result indicates that almost all the microchannel widths have symmetrical distribution. The maximum value appears near the edge while the minimum value in the middle microchannel. For all the structural parameters, the rake angle of manifold has a considerable effect on the microchannel width, and the preset value of microchannel width shows a slight influence.
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Bondar, Farshid, and Francine Battaglia. "A Computational Study on Mixing of Two-Phase Flow in Microchannels." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-43957.

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The passive mixing of water and alcohol, as two fluids with different densities, is carried out computationally in three-dimensional microchannels. Four designs of microchannels are considered to investigate the efficiency of mixing for Reynolds numbers ranging between 6 and 96. In a straight-type microchannel, mixing is very poor. In a square-wave-type microchannel, mixing is marginally better than the straight one. Mixing in the serpentine-type and twisted-type microchannels develops considerable better than the first two microchannels, especially at higher Reynolds numbers. However, in the twisted microchannel, the mixing index is substantially larger compared to the serpentine microchannel for the Reynolds number of 35. The higher mixing index implies the occurrence of spatially chaotic flows with a higher degree of chaos compared to the case of the serpentine microchannel. The results are compared quantitatively and qualitatively in Eulerian and Lagrangian frameworks and a correlation between Lagrangian chaos and Eulerian chaos is concluded.
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Singh, Pawan K., T. Sundararajan, and Sarit K. Das. "Hydrodynamic Study of Nanofluids in Microchannel." In ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASMEDC, 2009. http://dx.doi.org/10.1115/mnhmt2009-18180.

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Present study tries to put light on hydrodynamics of nanofluids in microchannels. For the present hydrodynamic study, the microchannels of hydraulic diameters of 212 and 301 μm are used. Present study also uses nanofluids in microchannel. To observe the hydrodynamic effect of nanofluids in microchannel, the alumina nanoparticles with sizes 45 nm are chosen with the water as base fluid. The nanofluids with the dilute concentrations 0.25 vol% are used to observe the effect of volume fraction. From the study of base fluid flow in microchannel, it is found that the axial pressure drop is linear thus showing the incompressible behaviour of fluid. For all microchannels, early transition to turbulence was observed. Also for the same Re the pressure drop was higher for smaller channel. However, the usage of nanofluids in these microchannels shows different behavior from normal fluids. The axial pressure drop was again linear thus proving that even though these fluids are different from normal fluids; they follow the behaviour of incompressible Newtonian fluids. Surprisingly, the friction factor was similar for these fluids as compared to base fluids. This can be attributed to dilute concentration of nanofluids, which make them a homogeneous fluid. It suggests that the use of dilute nanofluids in microchannel results in no or little penalty in pressure drop. It also suggests that if nanofluids have to be used as a better coolant, the hydrodynamics and heat transfer characteristics has to be studied as higher concentrations.
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Chen, Pin-Chuan, Hong Wang, Daniel S. Park, Sunggook Park, Dimitris E. Nikitopoulos, Steven A. Soper, and Michael C. Murphy. "Protein Adsorption in a Continuous Flow Microchannel Environment." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68094.

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Protein adsorption is a critical issue in microfluidic devices especially for those reactions depending on proteins like the polymerase chain reaction (PCR). Understanding protein absorption phenomena in different geometry microchannels and evaluating the efficiency of dynamic coating, which has been using as a method to prevent protein adsorption, are important tasks. Two different sets of microchannels were designed and fabricated on polymers. Bovine serum albumin (BSA) was used as a model protein for quantification of and monitoring the protein loss in different microchannel geometries. Up to 58% of the BSA was lost after flowing a 2030 mm long microchannel. The BSA adsorption rate changed along the microchannel. Smaller microchannels required a longer time to achieve protein saturation point. Dynamic coating was shown to be a time consuming and inefficient method to prevent protein adsorption in a continuous flow environment.
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Parkhe, Avinash K., Amol Dhondiba Sul, Prathmesh Ramesh Kirgat, Atharv Santosh Joshi, Prakash Bhimrao Ghadage, and Vijay Rahane. "Fabrication of Micro-channels using CO2 LASER Machining & Soft Lithography for Lab-on-Chip Applications." In National Conference on Relevance of Engineering and Science for Environment and Society. AIJR Publisher, 2021. http://dx.doi.org/10.21467/proceedings.118.13.

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Microchannels are one of the most significant parts for the Lab-on-Chip applications. The microchannels fabrication is a crucial task. The Soft Lithography is one of the most favored methods of microchannel fabrication. The use of CO2 LASER machining for microchannel fabrication using Acrylic sheet is studied in this paper. The experimentation is carried out to see the effect of LASER scanning speed and laser power on the depth of the microchannel mold. It has observed that the channel depth is increasing linearly with increasing LASER power and decreasing with increase in speed. The straight microchannel configuration with Y shaped inlet having circular & elliptical obstacles has been fabricated using CO2 laser machining on acrylic sheet. Also, the fabricated molds are used to prepare the further microchannel molds using the Soft Lithography technique and then the microchannels prepared from Soft Lithography are used as a mold for the lab-on-chip applications like check the mixing length & mixing phenomenon etc.
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Odaymet, A., and H. Louahlia-Gualous. "Experimental Investigation of Steam Condensation in a Silicon Microchannel." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22191.

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Experimental investigations of a two-phase flow were conducted to study heat transfer and various flow patterns of steam condensation in two different microchannels. Microchannels have a rectangular cross-section with hydraulic diameter of 305μm (depth of 310μm and width of 300μm) and 410.5μm (depth of 312μm and width of 600μm). The length of each microchannel is of 50 mm. The silicon microchannel is covered with a transparent thin Pyrex plate to view different flow patterns. Microthermocouples (K-type, 20μm) were placed in rectangular silicon grooves. Measurements are carried out for different inlet pressures and flow rates of steam while the outlet pressure of the microchannel is kept at atmospheric pressure. Plug/slug flow patterns are observed in the microchannel for different mass fluxes. Local surface temperatures along the microchannel corresponding of each two-phase flow structure are measured and analyzed.
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Garimella, Suresh V., and Vishal Singhal. "Single-Phase Flow and Heat Transport in Microchannel Heat Sinks." In ASME 2003 1st International Conference on Microchannels and Minichannels. ASMEDC, 2003. http://dx.doi.org/10.1115/icmm2003-1018.

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Microchannel heat sinks are widely regarded as being amongst the most effective heat removal techniques from space-constrained electronic devices. However, the fluid flow and heat transfer in microchannels is not fully understood. The pumping requirements for flow through microchannels are also very high and none of the micropumps in the literature are truly suitable for this application. A wide-ranging research program on microchannel heat sinks and micropumps is underway in the Electronics Cooling Laboratory at Purdue University. This article provides an overview of the research being conducted to understand fluid flow and heat transfer in microchannels and to identify pumping requirements and suitable mechanisms for pumping in microchannels.
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Steinke, Mark E., and Satish G. Kandlikar. "Single-Phase Liquid Heat Transfer in Plain and Enhanced Microchannels." In ASME 4th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2006. http://dx.doi.org/10.1115/icnmm2006-96227.

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The development of advanced microchannel heat exchangers and microfluidic devices is dependent upon the understanding of the fundamental heat transfer processes that occur in these systems. There have been great advancements in our understanding of the heat transfer and fluid flow mechanisms that occur in microchannels. There is several research areas in microchannel heat transfer that so promise for such applications as microprocessor cooling. An enhanced microchannel heat exchanger (EMCHX) that uses single-phase liquid flows has been developed. This EMCHX uses flow obstructions to create a continually developing flow condition and the enhancement in heat transfer associated with that flow regime. A silicon substrate is chosen to create off-set strip fins in the microchannel flow field. Experimental verification of this new method shows excellent improvement in heat transfer over plain or traditional microchannels with straight, continuous walls. However, careful attention must be paid to the added pressure drop that is created by adding these obstructions. A new microchannel parameter called pumping power flux is developed to aid in the comparison between plain and enhanced microchannels. The pumping power flux is used in conjunction with the heat flux to calculate a coefficient of performance to demonstrate the heat transfer enhancement. The enhanced microchannels provide a much higher COP for the same flow conditions. Therefore, the improved heat transfer provided outweighs the added pressure drop caused by the enhanced microchannels.
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Kamble, D. A., and B. S. Gawali. "Analysis of Triangular Microchannel Under Forced Convection Heat Transfer Condition for Laminar Flow Condition." In ASME 2013 4th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/mnhmt2013-22204.

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Micro-convection is a strategic area in transport phenomena, since it is the basis for a wide range of miniaturized high-performance heat transfer applications. Surface area is one of the important parameter for high flux heat transfer in microchannel performance. This experimental study deals with heat transfer using triangular microchannel having hydraulic diameters of 321μm and 289μm. Experimentation is carried out for triangular microchannel set for different heat input and flow rate condition. Triangular microchannel are manufactured with EDM technology. Testing of microchannel under laminar flow is considered with different tip angle, spacing, and length of microchannels. The different microchannels made up of copper material with 29 microchannel each having three different sets of length of 50 mm, 70 mm and 90 mm respectively. Tip angles for triangular microchannel is varied 50 ° and 60 ° with width of 30 mm each respectively are analyzed numerically. Spacing between triangular microchannels is also varied and 300μm and 400μm are considered for the analysis. Water flow rate is considered laminar flow. The flow rate of water is varied from 0.0167 kg/sec to 0.167 kg/sce to carry away heat. It is observed that as hydraulic diameters increase the heat transfer coefficient decreases. As the heat input to microchannel increases from 10 Watt to 100 Watt the temperature drop across varies from 2° C to 22°C as water flow rate increases. The numerical analysis is done using computer C programming. Experimental result differ from theoretical for temperature drop with variation of 2°C to 5°C. It is also observed that in all triangular microchannels its geometry i.e. tip angle and hydraulic diameter are dominant parameters which influences on rate of heat transfer. With increasing channel depth, increases flow passage area therefore enhances heat transfer sufficiently. From experimentation a Nu number correlation is proposed with considering tip angle, length, spacing of microchannel and other related parameters.
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Reports on the topic "Microchannel"

1

Lewinsohn, Charles. Compact Ceramic Microchannel Heat Exchangers. Office of Scientific and Technical Information (OSTI), October 2016. http://dx.doi.org/10.2172/1344124.

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Lawal, Adeniyi, Woo Lee, Ron Besser, Donald Kientzler, and Luke Achenie. Microchannel Reactor System for Catalytic Hydrogenation. Office of Scientific and Technical Information (OSTI), December 2010. http://dx.doi.org/10.2172/1018952.

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3

Zhao, Y., M. M. Ohadi, and R. Radermacher. Microchannel Heat Exchangers with Carbon Dioxide. Office of Scientific and Technical Information (OSTI), September 2001. http://dx.doi.org/10.2172/795597.

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Gschneidner, Jr., Karl, and Vitalij Pecharsky. Production and Testing of Microchannel Magnetocaloric Regenerators. Office of Scientific and Technical Information (OSTI), July 2011. http://dx.doi.org/10.2172/1157068.

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5

MacArthur, D. W. A neutron detector based on microchannel plates. Office of Scientific and Technical Information (OSTI), June 1987. http://dx.doi.org/10.2172/6215140.

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Arora, Ravi. Distributive Distillation Enabled by Microchannel Process Technology. Office of Scientific and Technical Information (OSTI), January 2013. http://dx.doi.org/10.2172/1077001.

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Durbin, Samuel, Eric Lindgren, and Ramon Pulido. Measurement of Particulate Retention in Microchannel Flows. Office of Scientific and Technical Information (OSTI), September 2018. http://dx.doi.org/10.2172/1761926.

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8

Fronk, Brian, M. Drost, Vinod Narayanan, Brian Paul, Omer Dogen, Sourabh Apte, and Rajiv Malhotra. High Flux Microchannel Receiver Development Final Report. Office of Scientific and Technical Information (OSTI), September 2021. http://dx.doi.org/10.2172/1841581.

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9

Pecharsky, Vitalij, Karl Gschneidner, and Thomas Lograsso. Production and Testing of Microchannel of Magnetocaloric Regenerators. Office of Scientific and Technical Information (OSTI), July 2011. http://dx.doi.org/10.2172/1233430.

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10

TeGrotenhuis, Ward E., Daniel R. Bottenus, Eric W. Hoppe, Paul H. Humble, R. Lucke, and Michael R. Powell. Isotope Enrichment Using Microchannel Distillation Technology (Final Report). Office of Scientific and Technical Information (OSTI), November 2018. http://dx.doi.org/10.2172/1526733.

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