Index to NASA Tech Briefs, 1974

The following information was given for 1974: (1) abstracts of reports dealing with new technology derived from the research and development activities of NASA or the U.S. Atomic Energy Commission, arranged by subjects: electronics/electrical, electronics/electrical systems, physical sciences, materials/chemistry, life sciences, mechanics, machines, equipment and tools, fabrication technology, and computer programs, (2) indexes for the above documents: subject, personal author, originating center

Ames Research Center publications: A continuing bibliography, 1978

This bibliography lists formal NASA publications, journal articles, books, chapters of books, patents and contractor reports issued by Ames Research Center which were indexed by Scientific and Technical Aerospace Abstracts, Limited Scientific and Technical Aerospace Abstracts, and International Aerospace Abstracts in 1978. Citations are arranged by directorate, type of publication and NASA accession numbers. Subject, personal author, corporate source, contract number, and report/accession number indexes are provided

Aeronautical engineering: A continuing bibliography with indexes (supplement 249)

This bibliography lists 637 reports, articles, and other documents introduced into the NASA scientific and technical information system in November, 1988. Subject coverage includes: design, construction and testing of aircraft and aircraft engines; aircraft components, equipment and systems; ground support systems; and theoretical and applied aspects of aerodynamics and general fluid dynamics

Conference Proceedings of the 3rd Biennial Symposium on Turbulence in Liquids

The Third Biennial Symposium on Turbulence in Liquids showed further progress in the investigator\u27s ability to measure turbulence parameters and in the general understanding of turbulence. The most impressive advances in measurement seemed to be the ability to measure deeper into the turbulent boundary layer in order to obtain profiles over the entire turbulence production region and the rapid development of conditioned-sampling techniques for studying hypotheses for mechanisms

Shock tunnel studies of scramjet phenomena, supplement 8

Reports by the staff of the University of Oueensland on various research studies related to the advancement of scramjet technology are presented. These reports document the tests conducted in the reflected shock tunnel T4 and supporting research facilities that have been used to study the injection, mixing, and combustion of hydrogen fuel in generic scramjets at flow conditions typical of hypersonic flight. In addition, topics include the development of instrumentation and measurement technology, such as combustor wall shear and stream composition in pulse facilities, and numerical studies and analyses of the scramjet combustor process and the test facility operation. This research activity is Supplement 8 under NASA Grant NAGW-674

Index to NASA Tech Briefs, 1975

This index contains abstracts and four indexes--subject, personal author, originating Center, and Tech Brief number--for 1975 Tech Briefs

Experimental evaluation of heat transfer characteristics of silica nanofluid

Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010."June 2010." Cataloged from PDF version of thesis.Includes bibliographical references (p. 62-63).The laminar convective heat transfer characteristics were investigated for silica nanofluid. An experimental loop was built to obtain heat transfer coefficients for single-phase nanofluids in a circular conduit in laminar flow regime. Thermal conductivity and viscosity measurements were conducted on the silica nanofluid to determine the thermophysical properties needed for analysis. Qualitative tests showed that the silica nanofluid was a stable colloidal suspension under the temperature range expected in the heated flow loop up to 80°C. Experiments were performed in the flow loop for the silica nanofluid at 0.2 Vol.%, 1 Vol.%, and 5 Vol.% concentrations. It was found that the heat transfer coefficient increased only slightly, but the heat transfer increase is within the experimental uncertainty of ±10%. The experiment results were in agreement with correlations using the as-measured thermal conductivity and viscosity of the nanofluid. It is concluded that silica nanofluid tested in this study showed no abnormal heat transfer enhancement in the laminar flow regime.by Zihao Zhang.S.B

Bibliographies of the Jet Propulsion Laboratory, Numbers 39-1 through 39-5. Cumulative Bibliographic Index No. 41-1, Jan. 1938 - Jun. 1964

Cumulative index of Jet Propulsion Laboratory bibliographie

C.A.R.S. temperature measurements and chemical kinetic modelling of autoignition in a methanol-fuelled internal combustion engine

Bibliography: p. 258-268.The temperature inside the cylinder of a methanol-fuelled single-cylinder Ricardo E6 research engine running under knocking conditions, is measured by means of Coherent Anti-Stokes Raman Spectroscopy (CARS), and the pressure is measured with a pressure transducer. In order to obviate any errors arising from deficiencies in the spectral scaling laws which are commonly used to represent nitrogen Q-branch spectra at high pressure, a purely experimental technique is employed to derive temperatures from CARS spectra by cross-correlation with a reference library of spectra recorded in an accurately calibrated high-pressure high-temperature optical cell. The temperature and pressure profiles obtained from the engine running under knocking conditions, are then used as input data for chemical kinetic modelling of end-gas autoignition. Five published mechanisms (Grotheer et al 1992, Grotheer and Kelm 1989, Norton and Dryer 1989, Dove and Warnatz 1983, .and Esser and Warnatz 1987) are used in the autoignition study, and the results for the different mechanisms are compared. A good qualitative understanding of the mechanism underlying end-gas autoignition in the engine is obtained, although the calculated autoignition points occur slightly earlier than the observed point. A sensitivity analysis of the methanol autoignition system is undertaken, and the importance of the decomposition of hydrogen peroxide and the hydroperoxyl chemistry is demonstrated. The discrepancies between the predicted results of the different mechanisms is shown to be caused by a small number of sensitive reactions for which there are conflicting data. Finally, a linear mode analysis from the geometric qualitative theory of differential equations is performed on the non-linear chemical rate equations. The equilibrium points in the generalised phase space of the non-linear chemical system are shown to be defined in terms of three regions. The equilibrium points are unstable improper nodes in the first region (T 1170K)

Experimental Investigations of Flow Boiling Heat Transfer and Flow Instability in a Horizontal Microtube with an Inlet Orifice

Flow boiling heat transfer mechanism has been shown to be an attractive method for satisfying the expected cooling loads of microelectronic devices. One of the main challenges associated with flow boiling is the flow instability created by the two-phase flow process. The design of orifice placed at the entrance of microchannels has been proven to be an effective way of reducing or eliminating these flow instabilities in multichannel systems. The present thesis experimentally investigated the effect of inlet orifice in a single microtube on flow boiling heat transfer and associated flow instabilities using FC-72 as working fluid. The hydraulic diameter and length of microtube were fixed at 889 µm and 150 mm, respectively. The area ratios of inlet orifice to main microtube were selected as 50%, 35%, and 20%. The results showed that the ratio of pressure drop by inlet orifice to the total pressure drop reduced as mass flux and vapor quality increased. Inlet orifice did not have significant effects on the forced convective boiling heat transfer and normal critical heat flux, but increased the nucleate boiling heat transfer and premature critical heat flux. A novel flow stability map was developed and two critical boundaries were identified, which divide the flow into stable and unstable regimes. The microtube with 20% inlet orifice had a best performance on flow stabilization since a large upstream pressure was created. A methodology was also developed in order to predict the onset of flow instability in single microtubes with different sizes of inlet orifices. The predicted heat flux at the onset of flow instability was compared with the experiment and showed a reasonable agreement within ± 30%. Overall, the performance of inlet orifices on flow boiling heat transfer and flow instability has been investigated in a single microtube. The present fundamental work is expected to lead to creation and development of a number of miniaturized devices, which are associated with flow boiling