Relevant bibliographies by topics / Methods of Videography

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Methods of Videography'

Author: Grafiati
Published: 4 June 2021
Last updated: 16 February 2022

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Journal articles on the topic "Methods of Videography"

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Koike, Takafumi, Michio Oikawa, and Kei Utsugi. "Moire Reduction Methods for Integral Videography." Journal of The Institute of Image Information and Television Engineers 61, no. 6 (2007): 814–21. http://dx.doi.org/10.3169/itej.61.814.

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Skoglund, Annika, David Redmalm, and Karin Berglund. "Videography – studying ethical uncertainty in alternative entrepreneurship." Society and Business Review 15, no. 4 (November 19, 2020): 305–24. http://dx.doi.org/10.1108/sbr-06-2019-0087.

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Purpose The purpose of this paper is to develop videographic methods for the study of alternative entrepreneurship, with a theoretical focus on “ethical uncertainties”, exemplified in this paper by the exploration of evolving actions and unpredictable outcomes in a specific case, the Hungarian company Prezi. Design/methodology/approach By first situating Prezi’s alternative entrepreneurship in the turbulent Hungarian political context and situation for the Roma population, this study presents how the methodological foundations of organizational videography have affirmed aesthetic immersion, which is of particular use for the study of ethical uncertainty. Findings Following a methodological exploration of the specific research design and ethnographic reflections on three ways in which ethical uncertainties arise, this study discusses the videographic possibilities to study something as elusive as ethical uncertainty and its link to alternative futures. Originality/value The political context in Hungary poses many challenges for organizations that attempt to “do good” and create alternative futures. This paper explains how this political context permeates Prezi’s entrepreneurship and research thereof, by highlighting “ethical uncertainty”. The combined contribution (paper and videography) invites the reader to think differently about the authority of research, become a viewer and reflect on their own experiences of ethical uncertainty in alternative entrepreneurship.
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Woznica, Marcel. "Videographie im Wandel." Qualitative Online-Forschung. Methodische und methodologische Herausforderungen 21, no. 1-2020 (July 8, 2020): 53–68. http://dx.doi.org/10.3224/zqf.v21i1.04.

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Im vorliegenden Beitrag wird ein videographisches Forschungsdesign vorgestellt und auf das populäre Augmented Reality (AR) Mobile Game Pokémon GO angewendet. Dabei wird herausgearbeitet, wie ein mediatisiertes Phänomen methodisch untersucht werden kann, welches sich vor allem durch seine kleinteiligen, an die Spiel- und/oder Alltagsrealität gerichteten Interaktionsformen sowie seine flüchtige Spielpraxis auszeichnet. Es wird eine phänomenologische und dramatologische Perspektive eingenommen, um eben diese methodischen Kernprobleme herauszuarbeiten. Das Datenmaterial, das mit einer mobilen GoPro Kamera erhoben wurde, wird mit Hilfe der (sequenzanalytischen) Rahmenanalyse (Goffman 1977) ausgewertet. Bei der Vorstellung der Ergebnisse kommt das Konzept der synthetischen Situation (Knorr-Cetina 2009) zur Anwendung und wird um den Aspekt des mediatisierten Alltagsraumes und seiner interaktiven und körperlich-performativen Herstellung erweitert.
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Tathawee, Thanaban, Wandee Wattanachaiyingcharoen, Anantachai Suwannakom, and Surisak Prasarnpun. "Flash communication pattern analysis of fireflies based on computer vision." International Journal of Advances in Intelligent Informatics 6, no. 1 (March 31, 2020): 60. http://dx.doi.org/10.26555/ijain.v6i1.367.

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Previous methods for detecting the flashing behavior of fireflies were using either a photomultiplier tube, a stopwatch, or videography. Limitations and problems are associated with these methods, i.e., errors in data collection and analysis, and it is time-consuming. This study aims to applied a computer vision approach to reduce the time of data collection and analysis as compared to the videography methods by illuminance calculation, time of flash occurrence, and optimize the position coordinate automatically and tracking each firefly individually. The Validation of the approach was performed by comparing the flashing data of male fireflies, Sclerotia aquatilis that was obtained from the analysis of the behavioral video. The pulse duration, flash interval, and flash patterns of S. aquatilis were similar to a reference study. The accuracy ratio of the tracking algorithm for tracking multiple fireflies was 0.94. The time consumption required to analyze the video decreased up to 96.82% and 76.91% when compared with videography and the stopwatch method, respectively. Therefore, this program could be employed as an alternative technique for the study of fireflies flashing behavior.
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Ueba, Tetsuya, Masakazu Okawa, Hiroshi Abe, Masani Nonaka, Mitsutoshi Iwaasa, Toshio Higashi, Tooru Inoue, and Koichi Takano. "Identification of venous sinus, tumor location, and pial supply during meningioma surgery by transdural indocyanine green videography." Journal of Neurosurgery 118, no. 3 (March 2013): 632–36. http://dx.doi.org/10.3171/2012.11.jns121113.

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Object Indocyanine green (ICG) videography is commonly used in the neurosurgical field for minimally invasive neurosurgery. The aim of this study was to evaluate a new intraoperative imaging modality by performing transdural ICG videography during surgery for meningiomas. Methods Between March 2011 and April 2012, 10 patients with meningiomas received intravenous injection of 12.5 mg ICG just prior to dural opening. The cases comprised 8 convexity meningiomas and 2 foramen magnum meningiomas. Efficacy of the transdural ICG videography was assessed in terms of the tumor volume, the circulation time from the first appearance of the vessel to the appearance of the venous sinus, the tendency to bleed, and the discrimination of the venous sinus. Results The mean tumor volume was 71.6 ± 87.9 ml (the mean is expressed ± SD throughout). The cortical arteries, veins, and the venous sinus were identified by the ICG videography transdurally. The projection of the meningiomas was identified by a shadow (which the authors call the eclipse sign). Total eclipse signs were obtained in 8 cases and partial eclipse signs were obtained in 2 cases; tumor volume in the latter was more than 200 ml. In 5 of 10 cases the adjacent venous sinuses were exposed and were successfully visualized by ICG videography in 5.92 ± 1.05 seconds from the first appearance of the vessel. In 5 of 10 cases the total and the partial eclipse signs were diminished in 3.46 ± 1.31 seconds. The diminishment of the total and the partial eclipse sign was earlier than the visualization of the venous sinus (p = 0.011, t-test), revealing bleeding from the tumor that was observed until coagulation of the feeding arteries from the intracranial arteries. Conclusions Prior to opening of the dura mater, transdural ICG videography was used successfully to visualize the dural attachment of meningiomas and the venous sinus, resulting in safe and appropriate dural opening. The diminishment of the total and partial eclipse signs may represent significant feeding from the intracranial arteries and a tendency to bleed during resection.
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Koike, Takafumi, Kei Utsugi, and Michio Oikawa. "Moiré-reduction methods for integral videography autostereoscopic display with color-filter LCD." Journal of the Society for Information Display 18, no. 9 (2010): 678. http://dx.doi.org/10.1889/jsid18.9.678.

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Merchant, Stephanie. "The Body and the Senses: Visual Methods, Videography and the Submarine Sensorium." Body & Society 17, no. 1 (March 2011): 53–72. http://dx.doi.org/10.1177/1357034x10394670.

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Webster, Cynthia M., Richard Seymour, and Kate Daellenbach. "“Behind Closed Doors”: opportunity identification through observational research." Qualitative Market Research: An International Journal 13, no. 1 (January 19, 2010): 24–35. http://dx.doi.org/10.1108/13522751011013954.

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PurposeTo thrive in today's competitive marketplace, businesses constantly need to search for opportunities to develop and be tuned into consumers as innovators. With this in mind, the purpose of this paper is to further understandings of the ways in which consumers transform ordinary products to serve their everyday needs; and broaden appreciation of the role observational research plays in opportunity identification.Design/methodology/approachA hermeneutic approach to observational research is adopted, incorporating both subjective personal introspection (SPI) and videography to discover one family's unusual usage behaviours.FindingsAnalysis, following Holbrook's typology of consumer value, reveals examples of innovative behaviours for the four active consumer value types of efficiency, status, play and ethics, while identification of the reactive value types of aesthetics, esteem, excellence and spirituality proves more difficult.Research limitations/implicationsThis research suggests alternative approaches for future research into opportunity identification, making use of videography and SPI. Moreover, the current work emphasises that innovation and the creative require consideration of the relational rather than just self‐seeking behaviours, needs or events.Originality/valueThis paper illustrates two research methods infrequently used, SPI and videography, positioning both as valuable tools for opportunity identification.
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Knoblauch, Hubert, and Bernt Schnettler. "Video and Vision." Journal of Contemporary Ethnography 44, no. 5 (May 28, 2015): 636–56. http://dx.doi.org/10.1177/0891241615587379.

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In this article, we sketch the field of qualitative video-analysis and locate videography within this. Instead of presenting the methods of videography formally, we illustrate the application of this method in a particular field: Marian apparitions occurring in a German town in 1999, captured live on video. The presentation of the method in this paper follows a general methodological structure. (1) We first outline the ethnographic context of the setting in which the video-recordings were made. This context includes actors, religious associations, and locations as well as some aspects of the apparitional events’ historical genesis. (2) We then turn to look at the performance of the Marian vision as recorded in the video. By applying sequential analysis, we roughly identify a temporal order to the event, which exhibits an interesting deviation from earlier forms of apparitions due to the way it takes a subjectively “spiritual” form. This finding leads us to finally (3) address the role of the subjective perspective that, as we argue, is a further essential dimension of videography. It is on this level that we are made aware of the relevance of the life-world as a methodological background for the kind of interpretive social science that takes the actor’s perspective into account.
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Chaudhary, Jyoti, Sanket Agarkar, Ravindra Manerikar, and Jayesh Rahalkar. "Comparison between Still Photography and Videography for Smile Analysis." APOS Trends in Orthodontics 7 (June 1, 2017): 135–44. http://dx.doi.org/10.4103/apos.apos_48_17.

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Introduction The aim of this systematic review was to compare still photography and videography for smile analysis. Materials and Methods Based on the available data, two authors conducted an electronic database PubMed search from January 1, 2000, to December 31, 2015, and ten strategies were designed using five keywords along with their respective synonyms. Twelve articles were shortlisted for the systematic review. Results The search yielded 91 articles, of which 12 were included based on the selection criteria. Of these 12, five concluded videography compared to be a better tool. Seven articles had variable conclusions based on the study setting and population evaluated. Conclusions Digital video clips offer a tremendous amount of information for analyzing the dynamic character of the smile, but a standard digital photograph allows for immediate viewing.
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Dissertations / Theses on the topic "Methods of Videography"

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Prantl, Daniel, and Christopher Wallbaum. "Videography on the Way to the Analytical Short Film: Managing the ambiguity in interaction regarding video material." Georg Olms Verlag, 2018. https://slub.qucosa.de/id/qucosa%3A34614.

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This chapter gives a brief overview of research methods using video material, lead by the question how these manage the ambiguity lying in interaction regarding this footage. The argument is put forward that, from a perspective of symbolic interactionism, in order to adequately make assertions regarding video material it is necessary to use video itself as a key statement in scientific discourse.
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Wallbaum, Christopher. "The analytical short film: Form – Functions – Excursus – Criteria." Georg Olms Verlag, 2018. https://slub.qucosa.de/id/qucosa%3A34615.

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This chapter presents the form of the Analytical Short Film (ASF), its functions for communication, education and research and criteria for its validity. Embedded is a fundamental reflection about the relations between something whole and its parts to give reasons for dealing with blurredness in both, practice in lessons and video practice.
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Reames, Steve. "Detecting the Presence of Disease by Unifying Two Methods of Remote Sensing." Thesis, University of North Texas, 2002. https://digital.library.unt.edu/ark:/67531/metadc3120/.

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There is currently no effective tool available to quickly and economically measure a change in landmass in the setting of biomedical professionals and environmental specialists. The purpose of this study is to structure and demonstrate a statistical change-detection method using remotely sensed data that can detect the presence of an infectious land borne disease. Data sources included the Texas Department of Health database, which provided the types of infectious land borne diseases and indicated the geographical area to study. Methods of data collection included the gathering of images produced by digital orthophoto quadrangle and aerial videography and Landsat. Also, a method was developed to identify statistically the severity of changes of the landmass over a three-year period. Data analysis included using a unique statistical detection procedure to measure the severity of change in landmass when a disease was not present and when the disease was present. The statistical detection method was applied to two different remotely sensed platform types and again to two like remotely sensed platform types. The results indicated that when the statistical change detection method was used for two different types of remote sensing mediums (i.e.-digital orthophoto quadrangle and aerial videography), the results were negative due to skewed and unreliable data. However, when two like remote sensing mediums were used (i.e.- videography to videography and Landsat to Landsat) the results were positive and the data were reliable.
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Prantl, Daniel, and Christopher Wallbaum. "The analytical short film in teacher education: Report of an accompanying research study in university teaching." Georg Olms Verlag, 2018. https://slub.qucosa.de/id/qucosa%3A34631.

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This chapter presents the application of the method of the Analytical Short Film in teacher education seminars and the main results of an accompanying research. Central findings indicate that the usage of the method increases the students’ abilities of reasoning on a scientific basis and improves their levels of reflection (Roters 2012).
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Book chapters on the topic "Methods of Videography"

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Skoglund, Annika. "Videography." In The Routledge Companion to Organizational Diversity Research Methods, 189–200. 1 Edition. | New York: Routledge, 2020.: Routledge, 2020. http://dx.doi.org/10.4324/9780429265716-18.

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Betke, Margrit, Tyson Hedrick, and Diane Theriault. "Multi-Camera Videography Methods for Aeroecology." In Aeroecology, 239–57. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-68576-2_10.

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Knoblauch, Hubert, and René Tuma. "Videography: An Interpretative Approach to Video-Recorded Micro-Social Interaction." In The SAGE Handbook of Visual Research Methods, 129–42. 1 Oliver's Yard, 55 City Road London EC1Y 1SP: SAGE Publications, Inc., 2020. http://dx.doi.org/10.4135/9781526417015.n8.

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Peterson, M. V., D. Ewins, A. Shaheen, and P. A. Catalfamo Formento. "Evaluation of Methods Based on Conventional Videography for Detection of Gait Events." In VI Latin American Congress on Biomedical Engineering CLAIB 2014, Paraná, Argentina 29, 30 & 31 October 2014, 234–37. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13117-7_61.

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Arcila Cano, A., D. Ewins, A. Shaheen, and P. Catalfamo Formento. "Evaluation of methods based on conventional videography for detection of gait events." In VII Latin American Congress on Biomedical Engineering CLAIB 2016, Bucaramanga, Santander, Colombia, October 26th -28th, 2016, 181–84. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4086-3_46.

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Hampl, Stefan. "Videos interpretieren und darstellen. Die dokumentarische Methode." In Videographie praktizieren, 53–88. Wiesbaden: VS Verlag für Sozialwissenschaften, 2010. http://dx.doi.org/10.1007/978-3-531-92054-2_3.

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Tuma, René, and Bernt Schnettler. "Videographie." In Handbuch Methoden der empirischen Sozialforschung, 875–86. Wiesbaden: Springer Fachmedien Wiesbaden, 2014. http://dx.doi.org/10.1007/978-3-531-18939-0_68.

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Tuma, René, and Bernt Schnettler. "Videographie." In Handbuch Methoden der empirischen Sozialforschung, 1191–202. Wiesbaden: Springer Fachmedien Wiesbaden, 2019. http://dx.doi.org/10.1007/978-3-658-21308-4_86.

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Reichertz, Jo, and Carina Jasmin Englert. "Kontrolleure in der Trambahn. Zur Methode und Methodologie einer hermeneutischen Fallanalyse." In Videographie praktizieren, 25–51. Wiesbaden: VS Verlag für Sozialwissenschaften, 2010. http://dx.doi.org/10.1007/978-3-531-92054-2_2.

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Baltruschat, Astrid. "Der Interpretationsprozess nach der dokumentarischen Methode am Beispiel von Kurzfilmen über Schule." In Videographie praktizieren, 241–67. Wiesbaden: VS Verlag für Sozialwissenschaften, 2010. http://dx.doi.org/10.1007/978-3-531-92054-2_10.

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Conference papers on the topic "Methods of Videography"

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Vosicky, J., and J. McGlothlin. "7. Exposure Assessment Methods Using Direct-Reading Instruments and Videography." In AIHce 2000. AIHA, 2000. http://dx.doi.org/10.3320/1.2763840.

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Hayati, Hasti, David Eager, Ardian Jusufi, and Terry Brown. "A Study of Rapid Tetrapod Running and Turning Dynamics Utilizing Inertial Measurement Units in Greyhound Sprinting." In ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/detc2017-67691.

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Understanding the biomechanics of rapid running locomotion plays an important role in comparative biomechanics and bio-inspired engineering and is an integral part of animal welfare. However, this is not easily achieved using conventional methods of gait analysis: measuring ground reaction forces using a force plate, mainly on irregular granular terrain i.e. greyhounds in racing conditions or in animal’s natural habitats i.e. cheetahs in natural terrain. An alternative to measuring forces externally via force platforms embedded in track ways, we can attach inertial measurement units to agile quadrupeds to measure the effects of rapid running and turning. Here we deployed an IMU equipped with a tri-axial accelerometer on sprinting greyhounds to analyze rapid locomotion behaviors like dynamic banking and turning in conditions equivalent to racing. High speed videography and paw print analysis of the entire race were used for calibration. The results are beneficial in locomotion analysis and welfare of greyhounds.
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Shukla, Dhwanil, Nandeesh Hiremath, Sahaj Patel, and Narayanan Komerath. "Aerodynamic Interactions Study on Low-Re Coaxial and Quad-Rotor Configurations." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71005.

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Unmanned multi-rotor VTOL vehicles have recently gained importance in various applications such as videography, surveillance, search and rescue etc. suited to their small size and relatively cheap construction. Small scale UAVs struggle in providing satisfactory performance in terms of payload, range, and endurance because of higher viscosity-dominated losses, and due to yet to be understood rotor-rotor and rotor-airframe aerodynamic interactions. Viscosity dominated rotational flow field makes most potential flow methods, such as free wake model, invalid. A full N-S based approach for this problem is too expensive. Thus, a multi-rotor aerodynamic interaction study is necessary for understanding crucial phenomena, which will help in developing physics-based models which will be instrumental in multi-rotor UAV performance prediction and design optimization. In present work, a flow visualization and a high-speed stereo Particle Image Velocimetry (SPIV) study is done on two low Reynolds number multi-rotor arrangements with the aim of capturing vortex-vortex, blade-vortex and vortex-duct interactions. The first arrangement is a coaxial rotor in forward flight and another is an in-plane quad-rotor with and without duct. Instantaneous and average PIV data is being presented here with some observations and corresponding interpretations.
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Parida, F. C., P. M. Rao, S. S. Ramesh, B. Malarvizhi, V. Gopalakrishnan, E. H. V. M. Rao, N. Kasinathan, and S. E. Kannan. "Experimental Evaluation of Pool Fire Suppression Performance of Sodium Leak Collection Tray in Open Air." In 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/icone14-89592.

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In the event of sodium leakage from heat transfer circuits of fast breeder reactors (FBR), liquid sodium catches fire in ambient air leading to production of flame, smoke and heat. One of the passive fire protection methods involves immediate collection of the leaking sodium to a sodium hold-up vessel (SHV) covered with a sloping cover tray (SCT) having a few drain pipes and one vent pipe (as in Fig. 1). As soon as the liquid sodium falls on the sloping cover tray, gravity guides the sodium through drain pipes into the bottom tray in which self-extinction occurs due to oxygen starvation. This sodium fire protection equipment called leak collection tray (LCT) works without the intervention of an operator and external power source. A large number of LCTs are strategically arranged under the sodium circulating pipe lines in the FBR plants to serve as passive suppression devices. In order to test the efficacy of the LCT, four tests were conducted. Two tests were with LCT having three drain pipes and rest with one. In each experiment, nearly 40 kg of hot liquid sodium at 550 °C was discharged on the LCT in the open air. Continuous on-line monitoring of temperature at strategic locations (∼ 28 points) were carried out. Colour videography was employed for taking motion pictures of various time-dependent events like sodium dumping, appearance of flame and release of smoke through vent pipes. After self-extinction of sodium fire, the LCT was allowed to cool overnight in an argon atmosphere. Solid samples of sodium debris in the SCT and SHV were collected by manual core drilling machine. The samples were subjected to chemical analysis for determination of unburnt and burnt sodium. The results of the four tests revealed an interesting feature: LCT with three drain pipes showed far lower sodium collection efficiency and much higher sodium combustion than that with just one drain pipe. Thermal fluctuations in temperature sensor located near the tip of the drain pipe have indicated that transient freezing and remelting processes are responsible for this phenomenon. Moreover comparison of test results between present and earlier experiments has revealed that the LCT with funnel shaped SCT is superior to that with boat shaped SCT.
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McGlothlin, J., J. Vosicky, E. Peterson, E. Protopapas, and M. Hunt. "296. Development of a Risk Assessment Method Using Ergonomic Principles, Videography Techniques, and Real-Time Instruments." In AIHce 2000. AIHA, 2000. http://dx.doi.org/10.3320/1.2763638.

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Miller, Mary L., and Cameron Shankland. "Utilizing Low Level Videography and GIS to Rethink Traditional Phase I Environmental Site Assessments." In 2006 International Pipeline Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/ipc2006-10428.

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The method used for traditional “Phase I” Environmental Site Assessments (ESA’s) has required staff to physically walk the rights-of-way (ROW). In order to compete the ESA in a more timely and cost-effective manner than traditional techniques allowed, URS Corporation (URS) contracted LinearVision (LV) to fly the utility ROW and collect low-level, airborne, geo-referenced videography, complemented with geo-referenced still-imagery to enable URS to complete the Phase I ESA data analysis in their office. The data provided enabled URS’s analysts the ability to access all ROW points of interest in their Geographic Information System (GIS), and “fly” the line with oblique and downward perspectives from their computer screen. The digital video could be sped up or slowed down allowing URS the ability to review each frame for careful, detailed analysis, and identify potential recognized environmental conditions (RECs) and encroachment upon the ROW. The high-resolution still-imagery provided URS the ability to zoom into the potential REC for a closer inspection of site features, vegetation, and surrounding land use. URS created a database of potential RECs and areas of interest along with a simple user interface as a deliverable to the client, which allows the user to link directly to specific video frames and high-resolution photographs for their own review and analysis. The cost of the airborne data capture and processing was substantially less than a traditional Phase I ESA. Furthermore, the video and high-resolution images provided for a more comprehensive analysis tool, which can be reviewed by multiple analysts and catalogued for future reference by third parties. An additional benefit is that the high-resolution photographs can be imported into AutoCAD or other software for development of maps and figures. Overall, the net result of low-level GIS integrated videography is enhanced quality of data and a 50% reduction in total cost for the ROW project as compared to traditional Phase I ESA methodology.
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Talebi, Mohammadmahdi, Keith Cobry, Sahba Sadir, Roland Dittmeyer, and Peter Woias. "Flow Regime Detection of Boiling Flow in Microchannels Using Electrical Sensing Elements Validated by Videography." In ASME 2018 16th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icnmm2018-7729.

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In this work we present a method that provides the possibility to analyze directly the electrical properties of two-phase flow in microchannel boiling systems. It is shown that the use of impedimetric sensing techniques can be used to track two-phase boiling flow. In order to perform such measurements, the electrical impedance of the composite medium in the channel is measured using planar capacitive elements that are implemented over the channel on a glass lid. Working electrodes are fabricated using indium tin oxide on glass and are compressed against a precision machined metal microchannel. Therefore, it is possible to visually analyze two-phase flow inside the microchannel while simultaneously performing electrical impedance measurements. In order to prevent electrochemical reactions between the fluid inside the microchannel and electrodes on the glass lid, a thin layer of SU8 photoresist was deposited as a protective layer. The electrical impedance measurements were characterized over two-phase flow regimes including bubbly flow, slug flow and annular flow via comparison with simultaneous video recordings.
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Brandner, Juergen J., Eugen Anurjew, Edgar Hansjosten, Stefan Maikowske, Ulrich Schygulla, and Alice Vittoriosi. "Microstructure Devices for Water Evaporation." In ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30700.

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Evaporation of liquids is of major interest for many topics in process engineering. One of these is chemical process engineering, where evaporation of liquids and generation of superheated steam is mandatory for numerous processes. Generally, this is performed by use of classical pool boiling and evaporation process equipment. Another possibility is creating mixtures of gases and liquids, combined with a heating of this haze. Both methods provide relatively limited performance. Due to the advantages of microstructure devices especially in chemical process engineering [1] the interest in microstructure evaporators and steam generators have been increased through the last decade. In this publication several microstructure devices used for evaporation and generation of steam as well as superheating will be described. Here, normally electrically powered devices containing micro channels as well as non-channel microstructures are used due to better controllability of the temperature level. Micro channel heat exchangers have been designed, manufactured and tested at the Institute for Micro Process Engineering of the Karlsruhe Institute of Technology for more than 15 years. Starting with the famous Karlsruhe Cube, a cross-flow micro channel heat exchanger of various dimensions, not only conventional heat transfer between liquids or gases have been theoretically and experimentally examined but also phase transition from liquids to gases (evaporation) and condensation of liquids. However, the results obtained with sealed microstructure devices have often been unsatisfying. Thus, to learn more onto the evaporation process itself, an electrically powered device for optical inspection of the microstructures and the processes inside has been designed and manufactured [2]. This was further optimized and improved for better controllability and reliable experiments [3]. Exchangeable metallic micro channel array foils as well as an optical inspection of the evaporation process by high-speed videography have been integrated into the experimental setup. Fundamental research onto the influences of the geometry and dimensions of the integrated micro channels, the inlet flow distribution system geometry as well as the surface quality and surface coatings of the micro channels have been performed. While evaporation of liquids in crossflow and counterflow or co-current flow micro channel devices is possible, it is, in many cases, not possible to obtain superheated steam due to certain boundary conditions [4]. In most cases, the residence time is not sufficiently long, or the evaporation process itself can not be stabilized and controlled precisely enough. Thus, a new design was proposed to obtain complete evaporation and steam superheating. This microstructure evaporator consists of a concentric arrangement of semi-circular walls or semi-elliptic walls providing at least two nozzles to release the generated steam. The complete arrangement forms a row of circular blanks. An example of such geometry is shown in Figure 8. A maximum power density of 1400 kW · m−2 has been transferred using similar systems, while liquid could be completely evaporated and the generated steam superheated. This is, compared to liquid heat exchanges, a small value, but it has to be taken in account that the specific heat capacity of vapor is considerably smaller than that of liquids. It could also be shown that the arrangement in circular blanks with semi-elliptic side walls acts as a kind of micro mixer for the remaining liquid and generated steam and, therefore, enhances the evaporation.
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9

Michael, Edin, Santhosh Kumar Keerthi, Krishna Kant, Pankaj Kolhe, Raja Banerjee, and S. R. Chakravarthy. "Effect of Liquid/Gas Density Ratio on Primary Jet Breakup of Pressure Swirl Atomizer: Experimental and Numerical Study." In ASME 2019 Gas Turbine India Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gtindia2019-2513.

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Abstract This work reports experimental and numerical study of primary jet breakup of a pressure swirl atomizer. Experiments were performed in a constant volume spray chamber and the spray pattern was characterized as a function of different liquid/gas density ratios which was achieved by changing the ambient pressure. The liquid/gas density ratio was varied between ≈ 102 to 103 and the axial Reynold number was maintained at 6 × 103. Diffused backlight imaging in conjunction with high speed videography was used to visualize the spray. Parameters like spray cone angle, spray breakup length and flapping frequency was estimated. Additionally, POD analysis was performed to find the sheet instability modes. A corresponding numerical study using Coupled Level Set VOF method was performed keeping the liquid/gas density ratio of 10 and 102 to simulate the primary jet breakup using an in-house two-phase solver developed using OpenFOAM libraries. The solver was validated by following the numerical work of Fuster et al. Effect of computational mesh size on parameters like spray cone angle, breakup length was estimated.
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10

Elsisy, Moataz, Evan Poska, and Mostafa Bedewy. "Current-Dependent Kinetics of Self-Folding for Multi-Layer Polymers Using Local Resistive Heating." In ASME 2018 13th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/msec2018-6628.

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The purpose of this paper is to characterize the kinetics and direction of self-folding of pre-strained polystyrene (PSPS) and non-pre-strained styrene (NPS), which results from local shrinkage using a resistively heated ribbon in contact with the polymer sheet. A temperature gradient across the thickness of this shape memory polymer (SMP) sheet induces folding along the line of contact with the heating ribbon. Varying the electric current changes the degree of folding and extent of local material flow. This method can be used to create practical 3D structures. Sheets of PSPS and NPS were cut to 10 × 20 mm samples and their folding angles were plotted with respect to time, as obtained from in situ videography. In addition, the use of polyimide tape (Kapton) was investigated for controlling the direction of self-folding. Results show that folding happens on the opposite side of the sample with respect to the tape, regardless of which side the heating ribbon is on, or whether gravity is opposing the folding direction. Given the tunability of fold times and extent of local material flow, heat-assisted folding is a promising approach for manufacturing complex 3D lightweight structures by origami engineering.
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