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  • 51.
    Ogura, Kiteki
    et al.
    National Metrology Institute of Japan, Japan.
    Holmsten, Magnus
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Klason, Peter
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Volym, flöde, temperatur o densitet.
    Comparison of Co–C Eutectic-Point Cells for Thermocouple Calibration Between SP and NMIJ2014In: International journal of thermophysics, ISSN 0195-928X, E-ISSN 1572-9567, Vol. 36, no 2-3, p. 399-412Article in journal (Refereed)
    Abstract [en]

    As recently reported, the metal–carbon eutectic points seem to be useful as practical reference points for calibrating thermocouples. The melting temperature of the cobalt–carbon eutectic point (Co–C, 1324◦C) is an ideal solution for a reference point being at approximately the middle between the freezing point of copper (1084.62◦C) and the melting point of palladium (1554.8◦C). In this study, a comparison of reference Co–C cells used for thermocouple calibration service was performed between the Technical Institute of Sweden (SP) and the National Metrology Institute of Japan (NMIJ) by means of two circulating Pt/Pd thermocouples and one circulating Co–C cell in order to investigate the reliability of thermocouple calibration at the Co–C eutectic point. The reference Co–C cell at SP was designed and constructed in the National Physical Laboratory (NPL), and provided to SP, while the reference Co–C cell at NMIJ as well as the circulating cell was designed and constructed at NMIJ. The melting temperature of the reference Co–C cells at SP and NMIJ were evaluated by using the calibrated radiation thermometers at NPL and NMIJ, respectively, prior to the circulation of the thermocouples and the cell between SP and NMIJ. The temperature difference between the reference cells of SP and NMIJ, as measured by means of the circulating thermocouples, was found to be within 0.33◦C, while that measured by means of the circulating cell was found to be within 0.22◦C. The temperature of reference cells at SP and NMIJ was found to agree within an expanded uncertainty (k=2) in spite of different temperature traceability chains. This means that the calibration of thermocouples at the Co–C eutectic point was sufficiently reliable.

  • 52.
    Palm, Magnus
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik.
    Mattiasson, Kerstin
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Volym, flöde, temperatur o densitet.
    Nordling, Bengt
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energi och Bioekonomi, Klimatisering och installationsteknik.
    Segerdahl, Karin
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor.
    Kopparbeläggningar på induktiva flödesmätare2005Report (Refereed)
    Download full text (pdf)
    FULLTEXT01
  • 53.
    Pendrill, Leslie
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Andersson, Anne
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Kommunikation.
    Löfdahl, Gunn-Mari
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Volym, flöde, temperatur o densitet.
    Linkova, Marcela
    Ptackova, Katerina
    Henson, Andy
    Lea, Deborah
    Kovrzková, Jana
    Havrlantová, Silvie
    T2.8 - Social and ethical issues of metrology Deliverable D2.11. Recommendations to imporove the gender balance in European metrology.2007Report (Refereed)
  • 54.
    Pendrill, Leslie
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik.
    Löfdahl, Gunn-Mari
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Volym, flöde, temperatur o densitet.
    Magnusson, Bertil
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Oorganisk kemi (Kmoo).
    Sacconi, A.
    Metrology needs and measurement priorities in the Environmental sector2007Report (Refereed)
  • 55.
    Penttinen, Olle
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Volym, flöde, temperatur o densitet.
    Nilsson, Håkan
    Chalmers University of Technology, Sweden.
    A fully synthetic turbulent boundary condition with a homogeneous vortex distribution2015In: Computer Physics Communications, ISSN 0010-4655, E-ISSN 1879-2944, Vol. 190, p. 23-32Article in journal (Refereed)
    Abstract [en]

    Temporally and spatially resolved simulations of turbulent flow need realistic inlet velocity fluctuations. The vortex method, described and implemented in this work, adds vortices to the inlet mean flow profile. The vortices are randomly distributed over the inlet and they move across the extent of the inlet with a finite life-time. The initial vortex sizes, strengths, as well as their developing motion and life-times, are determined by the inlet mean velocity and turbulence distributions. In contrast to previous studies of the vortex method, the inlet mean velocity and turbulence distributions are in the present work theoretically determined, and thus form an explicit part of the boundary condition. This makes the method independent of precursor RANS simulations. Special care has been taken to distribute the vortices evenly across the inlet. The tangential velocity of the vortices is randomly initialized and the spatial and temporal correlation is preserved. An edge bouncing mechanism is implemented at solid boundaries.

    The boundary condition is applied to a DNS simulation of pipe flow at a Reynolds number of 5300, based on pipe diameter, aiming at reaching fully developed conditions at a short distance from the inlet. The results are compared with those using cyclic boundary conditions, and with two DNS results found in the literature. It is shown that a good agreement is reached for the mean velocity profiles five pipe diameters downstream from the inlet. Also the resolved velocity fluctuations at that location are reasonable. It is concluded that the present implementation of the vortex method boundary condition, based on theoretical mean velocity and turbulence profiles, gives an inlet flow that is sufficiently realistic to reach a well-resolved fully developed turbulent pipe flow at five pipe diameters downstream the inlet.

  • 56.
    Persson, Henry
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research.
    Bremer, Peter
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Elektronik, Produktsäkerhet.
    Rosell, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Organisk kemi (Kmo).
    Lindström, Kent
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Volym, flöde, temperatur o densitet.
    Arrhenius, Karine
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Organisk kemi (Kmo).
    Fuel vapour composition and flammability properties of E852008Report (Refereed)
    Download full text (pdf)
    FULLTEXT01
  • 57.
    Persson, Henry
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Brandteknik, skydd (BRs ).
    Bremer, Peter
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Elektronik, Produktsäkerhet.
    Rosell, Lars
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Organisk kemi (Kmo).
    Lindström, Kent
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Volym, flöde, temperatur o densitet.
    Arrhenius, Karine
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Organisk kemi (Kmo).
    Sammansättning och antändningsegenskaper hos bränsleångor i tankar innehållande E852007Report (Refereed)
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    FULLTEXT01
  • 58.
    Rabone, J
    et al.
    Swinton Technology – UK.
    Lewis, K
    Swinton Technology – UK.
    Buker, O
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Volym, flöde, temperatur o densitet.
    Differential Pressure Meter Diagnostics – Independent Evaluation on Orifice Meter with Liquid Flow2015Conference paper (Other academic)
  • 59.
    Stolt, Krister
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Volym, flöde, temperatur o densitet. RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    Nerijus, Pedisius
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Volym, flöde, temperatur o densitet.
    Bilateral intercomparison between Lithuanian Energy Institute (LEI) and Swedish National Testing and Research Institute (SP), in the field of volume of kerosene. Flow rate 150-700 l/min2004Report (Refereed)
    Abstract [en]

    The result of this bilateral intercomparison between LEI and SP, of calibration of a PD-meter for kerosene, indicate excellent agreement of the calibration results. The resulting En-values range from 0,03 to 0,32, i.e. with very good margins to the limit value of 1.

    Download full text (pdf)
    FULLTEXT01
  • 60.
    Tawackolian, Karsten
    et al.
    PTB Physikalisch-Technische Bundesanstalt, Germany.
    Büker, Oliver
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Mätteknik, Volym, flöde, temperatur o densitet.
    Hogendoorn, Jankees
    KROHNE Altometer, The Netherlands.
    Lederer, Thomas
    PTB Physikalisch-Technische Bundesanstalt, Germany.
    Investigation of a ten-path ultrasonic flow meter for accurate feedwater measurements2014In: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 25, no 7, p. 75304-Article in journal (Refereed)
    Abstract [en]

    The flow instruments used in thermal power plants cannot be calibrated directly for the actual process conditions, since no traceable calibration facility with known uncertainty is available. Asystematic investigation of the relevant influence parameters is therefore needed. It was found in earlier investigations that the dominant influences on the measurement uncertainty are the flowvelocity profile and the temperature. In the present work, we report on our experimental study of the temperature and Reynolds number dependence of a new ten-path ultrasonic flow meterprototype. An improved measuring program is developed that allows for a systematic characterization. Special emphasis was placed on producing and validating well defined velocity profiles on aprecision calibration flow rig. It was also for the first time intended and validated to generate fully developed Reynolds-similar velocity profiles for different temperatures so that the two main influence parameters, namely temperature and Reynolds number, can be clearly characterized separately. Since such ideal measurement conditions are not found in practical applications, the approach is also tested for a disturbed flow condition. A well defined disturbance is generated with a new flow disturber.

12 51 - 60 of 60
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