Academic literature on the topic 'Coronal heating at small scales'

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Journal articles on the topic "Coronal heating at small scales"

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Buchlin, É. "Intermittent heating of the solar corona by MHD turbulence." Nonlinear Processes in Geophysics 14, no. 5 (2007): 649–54. http://dx.doi.org/10.5194/npg-14-649-2007.

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Abstract. As the dissipation mechanisms considered for the heating of the solar corona would be sufficiently efficient only in the presence of small scales, turbulence is thought to be a key player in the coronal heating processes: it allows indeed to transfer energy from the large scales to these small scales. While Direct numerical simulations which have been performed to investigate the properties of magnetohydrodynamic turbulence in the corona have provided interesting results, they are limited to small Reynolds numbers. We present here a model of coronal loop turbulence involving shell-mo
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Zou, Jitong, Aohua Mao, Xiaogang Wang, Yangyang Hua, and Tianchun Zhou. "Solar Coronal Heating Fueled by Random Bursts of Fine-scale Magnetic Reconnection in Turbulent Plasma Regions." Astrophysical Journal 943, no. 2 (2023): 155. http://dx.doi.org/10.3847/1538-4357/acaec2.

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Abstract Coronal heating is a longstanding issue in solar physics as well as plasma physics in general. In recent years, significant resolution improvements of satellite observations have contributed to a deeper understanding of small-scale physics, e.g., magnetic reconnection processes on fine scales inside the turbulent geo-magnetosheath. Coronal plasmas feature turbulent complexity of flows and magnetic fields with similar fine scales, and thus electron magnetic reconnection is very likely to be excited in the coronal region working as one of the ways to heat the solar corona, which offers
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Howson, T. A., I. De Moortel, and L. E. Fyfe. "The effects of driving time scales on heating in a coronal arcade." Astronomy & Astrophysics 643 (November 2020): A85. http://dx.doi.org/10.1051/0004-6361/202038869.

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Context. The relative importance of alternating current (AC) and direct current (DC) heating mechanisms in maintaining the temperature of the solar corona is not well constrained. Aims. We aim to investigate the effects of the characteristic time scales of photospheric driving on the injection and dissipation of magnetic and kinetic energy within a coronal arcade. Methods. We conducted three-dimensional magnetohydrodynamic simulations of complex foot point driving imposed on a potential coronal arcade. We modified the typical time scales associated with the velocity driver to understand the ef
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Velli, M., F. Pucci, F. Rappazzo, and A. Tenerani. "Models of coronal heating, turbulence and fast reconnection." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 373, no. 2042 (2015): 20140262. http://dx.doi.org/10.1098/rsta.2014.0262.

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Coronal heating is at the origin of the EUV and X-ray emission and mass loss from the sun and many other stars. While different scenarios have been proposed to explain the heating of magnetically confined and open regions of the corona, they must all rely on the transfer, storage and dissipation of the abundant energy present in photospheric motions, which, coupled to magnetic fields, give rise to the complex phenomenology seen at the chromosphere and transition region (i.e. spicules, jets, ‘tornadoes’). Here we discuss models and numerical simulations which rely on magnetic fields and electri
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Howson, Thomas. "How Transverse Waves Drive Turbulence in the Solar Corona." Symmetry 14, no. 2 (2022): 384. http://dx.doi.org/10.3390/sym14020384.

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Oscillatory power is pervasive throughout the solar corona, and magnetohydrodynamic (MHD) waves may carry a significant energy flux throughout the Sun’s atmosphere. As a result, over much of the past century, these waves have attracted great interest in the context of the coronal heating problem. They are a potential source of the energy required to maintain the high-temperature plasma and may accelerate the fast solar wind. Despite many observations of coronal waves, large uncertainties inhibit reliable estimates of their exact energy flux, and as such, it remains unclear whether they can con
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Lu, Zekun, Feng Chen, J. H. Guo, et al. "Periodic Coronal Rain Driven by Self-consistent Heating Process in a Radiative Magnetohydrodynamic Simulation." Astrophysical Journal Letters 973, no. 1 (2024): L1. http://dx.doi.org/10.3847/2041-8213/ad73d2.

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Abstract The periodic coronal rain and in-phase radiative intensity pulsations have been observed in multiple wavelengths in recent years. However, due to the lack of three-dimensional coronal magnetic fields and thermodynamic data in observations, it remains challenging to quantify the coronal heating rate that drives the mass cycles. In this work, based on the MURaM code, we conduct a three-dimensional radiative magnetohydrodynamic simulation spanning from the convective zone to the corona, where the solar atmosphere is heated self-consistently through dissipation resulting from magnetoconve
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Pontin, D. I., E. R. Priest, L. P. Chitta, and V. S. Titov. "Coronal Heating and Solar Wind Generation by Flux Cancellation Reconnection." Astrophysical Journal 960, no. 1 (2023): 51. http://dx.doi.org/10.3847/1538-4357/ad03eb.

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Abstract In this paper, we propose that flux cancellation on small granular scales (≲1000 km) ubiquitously drives reconnection at a multitude of sites in the low solar atmosphere, contributing to chromospheric/coronal heating and the generation of the solar wind. We analyze the energy conversion in these small-scale flux cancellation events using both analytical models and three-dimensional, resistive magnetohydrodynamic (MHD) simulations. The analytical models—in combination with the latest estimates of flux cancellation rates—allow us to estimate the energy release rates due to cancellation
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Gómez, Daniel O., and Pablo Dmitruk. "Turbulent heating of coronal active regions." Proceedings of the International Astronomical Union 3, S247 (2007): 269–78. http://dx.doi.org/10.1017/s1743921308014968.

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AbstractMagnetohydrodynamic turbulence has been proposed as a mechanism for the heating of coronal active regions, and has therefore been actively investigated in recent years. According to this scenario, a turbulent regime is driven by footpoint motions. The energy being pumped this way into active region loops, is efficiently transferred to small scales due to a direct energy cascade. The ensuing generation of fine scale structures, which is a natural outcome of turbulent regimes, helps to enhance the dissipation of either waves or DC currents.We present an updated overview of recent results
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Howson, T. A., I. De Moortel, and J. Reid. "Phase mixing and wave heating in a complex coronal plasma." Astronomy & Astrophysics 636 (April 2020): A40. http://dx.doi.org/10.1051/0004-6361/201937332.

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Aims. We investigate the formation of small scales and the related dissipation of magnetohydronamic (MHD) wave energy through non-linear interactions of counter-propagating, phase-mixed Alfvénic waves in a complex magnetic field. Methods. We conducted fully three-dimensional, non-ideal MHD simulations of transverse waves in complex magnetic field configurations. Continuous wave drivers were imposed on the foot points of magnetic field lines and the system was evolved for several Alfvén travel times. Phase-mixed waves were allowed to reflect off the upper boundary and the interactions between t
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Ionson, James A. "A Unified Theory of Coronal Heating." Symposium - International Astronomical Union 107 (1985): 139–43. http://dx.doi.org/10.1017/s0074180900075574.

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This presentation focuses upon the coronal heating problem and reports the results of Ionson's (1984) unified theory of electrodynamic heating. This generalized theory, which is based upon Ionson's (1982) LRC approach, unveils a variety of new heating mechanisms and links together previously proposed processes. Specifically, Ionson (1984) has derived a standing wave equation for the global current, I, driven by emfs that are generated by the β≳1 convection. This global electrodynamics equation has the same form as a driven LRC equation where the equivalent inductance, L=4ℓ/πc2, scales with the
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Dissertations / Theses on the topic "Coronal heating at small scales"

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Dolliou, Antoine. "L'impact de petits événements brillants UV-EUV sur le chauffage coronal du Soleil calme : analyse de données de Solar Orbiter et simulations hydrodynamiques de boucles magnétiques." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASP112.

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La couronne solaire est chauffée à plus de 1 MK. L'une des principales théories sur la formation de la couronne (Parker, 1988) suggère que l'énergie magnétique est dissipée dans la couronne par un grand nombre d'événements de chauffage impulsifs et peu énergétiques (1E24 ergs), appelés « nanoflares ». Le 30 mai 2020, lors de sa première séquence d'observation à haute résolution spatiale et temporelle, 1463 petits « événements » EUV de petite taille (400 - 4000 km) et de court temps de vie (10-200 s) ont été détectés dans le Soleil calme (QS) par l'imageur UV à haute résolution HRIEUV (174 Angs
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Joulin, Vincent. "Étude statistique et propriétés énergétiques des petits embrillancements dans la couronne solaire." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112102/document.

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Les grands événements de la couronne solaire (comme les flares avec une énergie de l'ordre de 10²³ J) ne suffisent pas à maintenir cette dernière aux températures de plus de un million de degrés qui y sont mesurées. La couronne doit alors être chauffée aux petites échelles, soit de façon continue, soit de façon intermittente. C'est pourquoi afin d'expliquer la température élevée de la couronne, beaucoup d'attention a été accordée aux distributions des énergies dissipées dans les plus petits événements (de l'ordre du mégamètre). En effet, si la distribution en énergie est assez pentue, les plus
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Book chapters on the topic "Coronal heating at small scales"

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Poedts, Stefaan. "On the Time Scales and the Efficiency of Solar Coronal Loop Heating by Resonant Absorption." In Mechanisms of Chromospheric and Coronal Heating. Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-87455-0_80.

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Katurji, Marwan, Bob Noonan, Jiawei Zhang, et al. "Atmospheric turbulent structures during shrub fires and implications for flaming zone behavior." In Advances in Forest Fire Research 2022. Imprensa da Universidade de Coimbra, 2022. http://dx.doi.org/10.14195/978-989-26-2298-9_212.

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Wildfires propagate across vegetated canopies exhibiting complex spread patterns. Wind gusts at the fire-front extend/intensify flames and direct convective heating towards unburnt fuels resulting in rapid acceleration of spread. This behavior could be modulated by ambient atmospheric boundary layer wind turbulence. Our aim is to characterize ambient turbulence over gorse shrub experimental burns and explore how this contributes to fire behavior. Developing coupled fire-atmosphere numerical models capable of resolving most turbulent energy scales is important for understanding rapid and small-scale dynamics. However, it is equally as important to design fire-burn experiments that allow for simultaneous measurements of fire behavior and atmospheric turbulence covering a range of the turbulent spectra. We have completed six experimental burns (24-hectares) in Rakaia, New Zealand under varying wind speed and direction and atmospheric stability regimes. The ignition process ensured a fire-line propagating through dense gorse bush (1m high). Two 30m high sonic anemometer towers measured turbulent wind velocity (20Hz) at six different height levels. Visible imagery was captured for all burns by cameras mounted on Un-crewed Aerial Vehicles (UAV) at 200m AGL. Using wavelet decomposition, we identified different turbulent scales that varied relative to height above vegetation and boundary layer thermal regimes. Quadrant analysis identified statistical distribution of atmospheric sweeps (downbursts of turbulence towards vegetation) and ejections (detachment of turbulence from vegetation). Discrete analysis of sweep/ejection events revealed their temporal and spatial scales and tracked their progression as the flaming zone approached the towers. Undergoing work aims to discern these interactions with observed fire sweeps from aerial imagery by applying image velocimetry techniques and sweep structure tracking
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Black, John H. "Excitation and Detectability of Molecules in Active Galactic Nuclei." In The Molecular Astrophysics of Stars and Galaxies. Oxford University PressOxford, 1998. http://dx.doi.org/10.1093/oso/9780198501589.003.0021.

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Abstract It is paradoxical that low-energy molecular processes might be important in the hostile, energetic environments near active galactic nuclei (AGNs). It now appears that observations of the molecular component of the central gas offer crucial insight into the physics of the AGN phenomenon. As reviewed in the preceding chapter, activity in galactic centres is displayed by nuclear starbursts on scales of 102 to 103 pc as well as the true AGNs, which are the compact, luminous sources that reside in the central 10 pc of quasi-stellar objects (QSOs), radio galaxies, and Seyfert galaxies. In this chapter we are concerned with the possible ways in which molecules can be used to investigate the inner workings of the true AGN. Observations throughout the electromagnetic spectnim now suggest that many AGN are buried inside small-scale discs or tori of gas and dust. These central gas systems reprocess the non-thermal continuum into complex emission-line spectra and shield the central source from view over much of the electromagnetic spectrum. Chapter 20 contains a brief introduction to a unification hypothesis, which has been proposed in order to explain the observations of Seyfert 1 and Seyfert 2 galaxies with a single model in which the spectroscopic differences reflect different orientations of the observer’s line of sight to the central obscuring disc or torus (see Antonucci 1993 for a review). There is some hope that the descriptions of radio galaxies, BL Lacertae objects, radio-quiet QSOs, and radio-loud QSOs (the true quasars) can be unified similarly. A compact system of gas and dust is central to the unification hypothesis. Theory suggests that such a system will exist as small dense clouds (Krolik and Begelman 1986, 1988), which will be partly molecular if the pressure is sufficiently high (Krolik and Lepp 1989; Maloney, Hollenbach and Tielens 1996). Photoionization of gas by a non-thermal X-ray source allows atoms in a wide range of states of ionization to co-exist with molecules. Molecules can respond to heating and ionization by X-rays with unusual abundances (e.g. Lepp and Dalgarno 1996) and distinctive excitation patterns (Draine and Woods 1990; Gredel and Dalgarno 1995; Tine et al. 1997).
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Goody, R. M., and Y. L. Yung. "Band Models." In Atmospheric Radiation. Oxford University Press, 1989. http://dx.doi.org/10.1093/oso/9780195051346.003.0006.

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Radiative heating calculations in the atmosphere involve four distinguishable scales of frequency. First, there is the comparatively slow variation with frequency of the Planck function and its derivative with respect to temperature. About one-half of the radiation from a black body at terrestrial temperatures lies in a wave number range of 500 cm-1. The second scale is that of the unresolved contour of a band. For atmospheric molecules other than water vapor, the Planck function is effectively constant over a single band; water vapor bands must be divided into sections of the order of 50 cm-1 wide before this is so. For a rotating molecule, the next relevant scale of frequency is that of the spacing between rotation lines, approximately 1-5 cm-1. Finally, there is the monochromatic scale on which the absorption coefficient may be treated as a constant, and for which Lambert’s absorption law is obeyed: of the order of one-fifth of a line width ≃ 2 x 10-2 cm-1 for a gas at atmospheric pressure, down to 2 x 10-4cm-1 for a Doppler line in the middle atmosphere. This step takes us to a division of the frequency scale that, when taken together with other features of the calculation, presents a formidable computation task. Calculations can, of course, be made and are made at this limiting spectral resolution (line-by-line calculations) but, despite the fact that they are technically feasible with modern computers, such calculations are rare and are usually performed to provide a few reference cases. The great majority of investigations make use of averages over many lines, embracing spectral ranges that are small compared to a band contour (narrow-band models), or over complete bands (wide-band models), or over the entire thermal spectrum (emissivity models.) There are a number of reasons for working with spectral averages. Practical considerations are that important classes of laboratory measurements, and most atmospheric observations (e.g., satellite radiometry) are made with some spectral averaging, often comparable to that of narrow-band models.
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Conference papers on the topic "Coronal heating at small scales"

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Podladchikova, O. "Role of driving scales in a model of coronal heating." In SOLAR WIND TEN: Proceedings of the Tenth International Solar Wind Conference. AIP, 2003. http://dx.doi.org/10.1063/1.1618601.

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Khan, Z. I., M. F. M. Zain, N. A. Z. Zakaria, N. E. A. Rashid, M. K. A. Mahmood, and Z. Suboh. "Enhancing Water Treatment Residuals Characterization Through MNDT-Assisted Dielectric Properties Investigation via Oven Heating." In 2023 International Conference on Manipulation, Automation and Robotics at Small Scales (MARSS). IEEE, 2023. http://dx.doi.org/10.1109/marss58567.2023.10294131.

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Xie, Dongcheng, Ruichen Liu, Yujie Yang, et al. "From Ceramic Tube to Microcantilever: A New Strategy for Low Power, Fast Heating and High Integrated Metal Oxide Semiconductor Gas Sensor." In 2020 International Conference on Manipulation, Automation and Robotics at Small Scales (MARSS). IEEE, 2020. http://dx.doi.org/10.1109/marss49294.2020.9307895.

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Pearce, John. "Simplified Medium Scale FEM Numerical Models of Magnetic Nanoparticle Heating: Study of Thermal Boundary Condition Effects." In ASME 2013 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/sbc2013-14172.

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Magnetic nanoparticles are currently under intense investigation as a heating strategy for hyperthermia cancer treatment because they are promising as a means to target the heating specifically to the tumor.[1–4] Currently, our ability to create practical and useful numerical models in dimensional spaces similar to ordinary small tumors is severely hampered by the multiple orders of magnitude of the relative scales: nm to mm. Consequently, the preponderance of literature on the topic describes experimental studies only. Detailed individual nanoparticle model spaces with moderate dimensions up
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Cornelius, Michael S., and Burl Donaldson. "Aluminum Particle Ignition Studies." In ASME 2012 Fluids Engineering Division Summer Meeting collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/fedsm2012-72424.

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Experiments have been performed to study the combustion criteria of aluminum particles at atmospheric pressure. The primary goal is to quantify the outcome for a particle into which thermal energy has been deposited. Experiments utilized instantaneous joule heating of an aluminum wire. Once the particle was generated, it fell under gravity and the flight was recorded by video; in some cases, the ignited particle quenched or fragmented, and the residue was collected for SEM and EDS imaging. This provided information related to the aluminum oxide shell which was formed when combustion occurred.
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Kandra, Deepak, Tryfon Charalampopoulos, and Ram Devireddy. "Numerical Investigation of a Novel Method to Vitrify Biological Tissues Using Pulsed Lasers and Cryogenic Temperatures." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56197.

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The ability to eliminate freezing damage using “vitrification” (or the formation of glass) has long been an area of intense interest in cryobiology. Typically vitrification is achieved when biological systems are cooled at rates ranging from ∼8,000 °C/min to ∼10,000 °C/min [1–5]. Using traditional cooling methods (immersion in liquid nitrogen), such high cooling rates are currently not achievable, in large tissue sections (∼cm’s). In the present study we investigate a novel method to achieve high cooling rates in large tissue sections by pulsed laser heating in conjunction with cryogenic tempe
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Martin, Michael James, and Harish Manohara. "Thermo-Electric Modeling of Nanotube-Based Environmental Sensors." In ASME 2013 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ipack2013-73053.

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Free-standing electrically conductive nanotube and nano-bridge structures offer a simple, small-scale, low-power option for pressure and temperature sensing. To sense pressure, a constant voltage is applied across the bridge. At small scales, the heat transfer coefficient is pressure-dependent. The change in the heat transfer coefficients result in the circuit operating at higher temperatures, with different resistances, at low pressures. This in turn will lead to a change in the electrical resistivity of the system. If the system is held at constant voltage, this can be measured as a change i
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Gong, Xiangyang, Manohar Kulkarni, and David E. Claridge. "A Case Study of Retrofitting a Demonstration Solar Energy Building." In ASME 2008 Power Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/power2008-60085.

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Hydronic solar systems with copper tube collectors or vacuum glass tube collectors are commonly used thermal-solar systems. These systems run well in residential buildings or in small scales for domestic water heating. These systems can be scaled up and applied to commercial buildings. The solar energy collected by these systems can be used to drive absorption chillers in summer and heat the feed water for boiler in winter. Properly designed and installed systems can save energy by utilizing free solar energy. However, operation and maintenance do have an important impact on whether these syst
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Azarifar, Mohammad, and Nazli Donmezer. "A Roadmap for Building Thermal Models for AlGaN/GaN HEMTs: Simplifications and Beyond." In ASME 2016 Heat Transfer Summer Conference collocated with the ASME 2016 Fluids Engineering Division Summer Meeting and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/ht2016-7383.

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AlGaN/GaN based high electron mobility transistors (HEMTs) have been intensively used due to their high-efficiency power switching and large current handling capabilities. However, the high power densities and localized heating in these devices form small, high temperature regions called hotspots. Analysis of heat removal from hotspots and temperature control of the entire device is necessary for the reliable design of HEMT devices. For accurate analysis of heat transfer using thermal simulations in such devices with heat transfer occurring at different length scales, a roadmap is needed. For
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Kingston, Todd A., Justin A. Weibel, and Suresh V. Garimella. "Quantitative Visualization of Vapor Bubble Growth in Diabatic Vapor-Liquid Microchannel Slug Flow." In ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems collocated with the ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ipack2015-48177.

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Slug flow is a commonly encountered flow regime in microchannels due to the influence of surface tension and vapor confinement at small length scales. Few experimental studies have considered diabatic vapor-liquid slug flow, owing to difficulties in generating a well-controlled and repeatable slug flow regime; generation of vapor by wall heating typically leads to large, stochastic variations in the vapor bubble characteristics. To facilitate the study of flow behavior and vapor-liquid interfaces under precisely controlled conditions, a diabatic, one-component, two-phase microchannel flow was
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