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Lecocq, Pierre; Llory, Michel; Quinet, J.-L.
Fluid mechanics applied to equipment and energy problems1975
Fluid mechanics applied to equipment and energy problems1975
AbstractAbstract
[en] Metallic continuous heat exchangers are discussed. They are classified according to the field of application. Heat transfer modes are reviewed (radiation, conduction, convection); the convective modes more frequent in continuous exchangers are emphasized (natural or forced convection with or without phase changes in the fluids involved). Some indications relating to pressure drop calculation in these apparatus are given before the calculation itself. The thermal and hydraulic aspects are stressed and rudiments are given in view of a mechanical study
[fr]
On traite des echangeurs continus metalliques. On les classe suivant le domaine d'application. On rappelle les modes de transferts thermiques (rayonnement, conduction, convection) en insistant sur les modes convectifs (convection naturelle ou forcee avec ou sans changement de phase des fluides en presence) qui sont le plus couramment rencontres dans les echangeurs continus. Avant d'aborder le calcul des echangeurs, on donne quelques indications relatives au calcul de pertes de pression dans ces appareils. On insiste sur l'aspect thermique et hydraulique et on donne quelques elements pour aborder l'etude mecaniqueOriginal Title
Introduction au calcul des echangeurs de chaleur continus
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Source
Hug, Michel (ed.); Electricite de France, 75 - Paris. Direction des Etudes et Recherches; p. 951-1025; 1975; Eyrolles; Paris, France
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Ohlmer, E.; Schulze, W.; Schulz, R.
Commission of the European Communities, Ispra (Italy). Joint Research Centre1981
Commission of the European Communities, Ispra (Italy). Joint Research Centre1981
AbstractAbstract
[en] The actual results of steady state pressure drop measurements in liquid phase for the LOBI-installation are presented and relevant data from the pressure drop investigations at LOBI are summarized
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1981; 53 p
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Report
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AbstractAbstract
[en] The pressure drops through contractions in horizontal single and two-phase flow were investigated. A total of 167 measurements were made for four different entrance shapes to study the effects of the entrance shape on the pressure drop through a contraction in horizontal single and two-phase flow. From this data, pressure drops were calculated and compared with the pressure drops predicted by analytical models for single and two-phase flow. For single phase flow the agreement between the data and predictions is within ±25%, whereas for two-phase flow Hoopes model, which gives a better agreement than the homogeneous model, underpredicts the data as much as 45%. In addition, the effects of void fraction and liquid phase mass velocity on the pressure drop through the sudden flow channel constraction were investigated for two-phase flow. (Author)
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Journal Article
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AbstractAbstract
[en] Equations for calculating the loss coefficient in combining flows in tee functions are obtained by an integral linear momentum balance. It is a practice, when solving this type of problem, to neglect the pressure difference in the upstream location as well as the wall-fluid interaction in the lateral branch of the junction. In this work it is demonstrated the influence of the above parameters on the loss coefficient based on experimental values and by apropriate algebraic manipulation of the loss coefficient values published by previous investigators. (Author)
[pt]
As equacoes para o calculo dos coeficientes de perda de carga em escoamentos confluentes sao obtidos basicamente, a partir do balanco do fluxo da quantidad de movimento linear. Os trabalhos conhecidos desprezam a diferenca das pressoes estaticas a montante da confluencia bem como o valor da reacao parede-fluido no ramo lateral. O presente trabalho apresenta a influencia dos termos referentes a essas grandezas a partir de alguns dados experimentais, bem como atraves de processamento adequado de valores experimentais de coeficientes de perda de carga obtidos por outros autores. (Autor)Original Title
Balanco do fluxo da quantidade de movimentos linear em escoamentos confluentes para obtencao dos coeficientes de perda de carga
Primary Subject
Source
Universidade Federal de Uberlandia (Brazil). Dept. de Engenharia Mecanica; 615 p; 1983; v. A p. 281-290; 7. Brazilian Congress on Mechanical Engineering; Uberlandia, MG (Brazil); 13-16 Dec 1983
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Miscellaneous
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Conference
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Kim, Hyung Kyu; Lee, Kang Hee; Kang, Heung Seok; Lee, Young Ho; Kim, Jae Yong; Yoon, Kyung Ho
Korea Atomic Energy Research Institute, Daejeon (Korea, Republic of)2009
Korea Atomic Energy Research Institute, Daejeon (Korea, Republic of)2009
AbstractAbstract
[en] The Korea Nuclear Fuel Co. requested the high frequency flow-induced vibration and pressure drop tests of top, mid, IFM, bottom grid candidates of HIPER and protective grid candidates of a commercial fuel. The following results were obtained for each test. 1) High frequency flow-induced vibration of HIPER spacer grids Measured maximum vibration amplitude of the HIPER mid grid was under 21 mm/s at lower region of the grid's center spring. The peak vibration amplitudes of the upper, IFM, and bottom grids were 5∼10 times less than that of the mid grid. Peak frequency associated with the peak amplitude have gradually increased with the flow velocity. This suggested that a high frequency vibration of grid was originated from the vortex shedding due to the thickness edge of grid strap. 2) Hydraulic vibration test of protective grids for a commercial fuel Peak vibration amplitudes of 16x16 type fuel protective grids were above 200 mm/s at the frontal direction of HyGrid 4. There might be a strong resonance near at the measurement point of the grid. Peak vibration amplitude of 17x17 type fuel were measured by 46.6 mm/s, 376.5 mm/s for the ACE7 and RFA protective grids in order. Peak frequency also had increasing trend with the bundle flow velocity. Measured pressure drops of 16x16 type fuel protective grids were comparatively higher than those of the reference fuel protective grids
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Dec 2009; 56 p; Also available from KAERI; 4 refs, 18 figs, 21 tabs
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AbstractAbstract
[en] Ten methods of the total two-phase pressure drop prediction based on five existing models and correlations have been examined for their accuracy and applicability to pressurized water reactor conditions. These methods were tested against 209 experimental data of local and bulk boiling conditions: Each correlations were evaluated for different ranges of pressure, mass velocity and quality, and best performing models were identified for each data subsets. A computer code entitled 'K-TWOPD' has been developed to calculate the total two phase pressure drop using the best performing existing correlations for a specific property range and a correction factor to compensate for the predicted error of the selected correlations. Assessment of this code shows that the present method fits all the available data within ±11% at a 95% confidence level compared with ± 25% for the existing correlations. (Author)
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AbstractAbstract
[en] An experience of application of the general-purpose pressure and pressure drop transformers at the Nuclear Power Engineering Institute of the BSSR Academy of Sciences for measurements on nitrogen tetroxide has been described. The concrete recommendations on the types of transformers and the volume of preparational work before putting them into operation have been given
Original Title
Opyt ehkspluatatsii obshchepromyshlennykh preobrazovatelej davleniya i perepada davleniya na azotnom tetrakside
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Journal Article
Journal
Vestsi Akadehmii Navuk BSSR. Seryya Fizika-Ehnergetychnykh Navuk; (no.3); p. 54-58
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Dubois, E.; Magot-Cuvru, P.; Deysson, J.Y.; Billard, F.; Madelaine, G.
Assessment of Airborne Radioactivity. Proceedings of a Symposium on Instruments and Techniques for the Assessment of Airborne Radioactivity in Nuclear Operations1967
Assessment of Airborne Radioactivity. Proceedings of a Symposium on Instruments and Techniques for the Assessment of Airborne Radioactivity in Nuclear Operations1967
AbstractAbstract
[en] It is desirable to calibrate impactors in order to gain quantitative information from the measurements made with them. Calibration of an impactor requires high reproduceability of the experimental conditions. In particular, the nature of the surface on which the deposit of particles is formed must be such that each impact is effective: the best results are obtained by coating the plates with an adhesive mixture of dioctylphthalate and Canada balsam. With this procedure, the shape of the curves for yield of stages is similar to that of theoretical curves. The geometry of the impactor with which the present study deals is such that certain dimensional relationships remain unchanged from one stage to the next. Furthermore, the curves for each stage can be reduced to a single curve by adopting a system of reduced co-ordinates. From this curve the different stages can easily be proportioned so as to localize at the desired point of the spectrum the cut-offs made by each stage. The same curve also indicates the effect of the rate at which air passes through the instrument on the stopping power of each stage. In the present case a throughput of 24 litres/min was selected; for four stages it corresponds to a pressure-drop of approximately 200 mm/Hg. The first and last cut-offs are at 0.5 and 4 μm, respectively. Depending on the use of the sample and the number of fractions desired, one or two intermediate stages can be eliminated. (author)
[fr]
Pour tirer des renseignements quantitatifs des mesures faites avec les impacteurs, il est souhaitable de les étalonner. L'étalonnage d'un impacteur requiert une grande reproductibilité des conditions expérimentales. En particulier, la nature de la surface sur laquelle se forme le dépôt de particules doit être telle que chaque impact soit efficace. Les meilleurs résultats en ce sens ont été obtenus en enduisant les lamelles d'un mélange adhésif dioctyphtalate, baume du Canada. Avec ce procédé, la forme des courbes de rendement par étage se rapproche de celle des courbes théoriques. La géométrie de l'impacteur, objet des présents travaux, est telle que certains rapports dimensionnels sont invariants d'un étage à l'autre. Les courbes relatives à chaque étage peuvent d'ailleurs se ramener à une courbe unique en adoptant un système de coordonnées réduites. A partir de cette courbe, il est alors aisé de dimensionner les différents étages, de manière à localiser aux endroits souhaités du spectre, les coupures faites par chaque étage. Cette même courbe permet de juger de l'influence du débit d'air traversant l'appareil sur le pouvoir d'arrêt de chaque étage. Dans le cas présent, un débit de 24 litres/min a été choisi. 11 correspond, pour quatre étages, S une perte de charge voisine de 200 mm de mercure. Les coupures extrêmes se situent respectivement vers 0,5 et 4 μm. Suivant l'utilisation du prélèvement et le nombre de fractions désirées, un ou deux étages intermédiaires peuvent être supprimés. (author)Original Title
Etude Experimentale d'Un Impacteur Annulaire
Primary Subject
Source
International Atomic Energy Agency, Vienna (Austria); 783 p; Dec 1967; p. 351-377; Symposium on Instruments and Techniques for the Assessment of Airborne Radioactivity in Nuclear Operations; Vienna (Austria); 3-7 Jul 1967; IAEA-SM--95/10; ISSN 0074-1884;
; 2 refs., 23 figs., 1 tab.

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Cunha Neto, J.A.B. da; Bollmann, A.
Proceedings of the 7. Brazilian Congress on Mechanical Engineering. v. A1983
Proceedings of the 7. Brazilian Congress on Mechanical Engineering. v. A1983
AbstractAbstract
[en] The results of an experimental investigation in divided-flow fittings head loss are presented. The main purposes are to verify the minimum value of the coefficient and to see it as a Carnot-Borda head-loss. The Reynolds number influence on head loss coefficients were qualitatively identified. The 90 degrees cross section fittings used in this experiment had a unitary area ratio. (Author)
[pt]
Relata-se o experimento com perdas de carga em escoamentos divididos, desenvolvido para um te secao quadrada e relacao de lados igual a unidade, conectado a 90 graus. Adicionalmente e investigada a influencia do numero de Reynolds do escoamento principal sobre os coeficientes de perda de carga, ainda que apenas qualitativamente. Os resultados obtidos sao interpretados com auxilio da equacao de Carnot-Borda e uma expressao e proposta para justificar o minimo valor do coeficiente experimentalmente verificado. (Autor)Original Title
Perdas de carga em escoamentos laterais
Primary Subject
Source
Universidade Federal de Uberlandia (Brazil). Dept. de Engenharia Mecanica; 615 p; 1983; v. A p. 257-267; 7. Brazilian Congress on Mechanical Engineering; Uberlandia, MG (Brazil); 13-16 Dec 1983
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Miscellaneous
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AbstractAbstract
[en] Single phase natural circulation is of interest in various energy systems, including solar heaters, nuclear reactors, geothermal power production, engine and computer cooling. The present paper deals with an experimental study on the influence of pressure drops on the behavior of a single-phase natural circulation loop. In a simple rectangular loop (MTT-1) located at DITEC, three series of tests have been carried out, with localized pressure drops (orifices of 6 mm, 10 mm and 14 mm diameter in the vertical legs) and different power levels. The experimental data are analyzed and compared with previous results obtained with smooth pipes, demonstrating the stabilizing effect of the pressure drops on the overall behavior of the loop
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Journal Article
Journal
International Communications in Heat and Mass Transfer; ISSN 0735-1933;
; CODEN IHMTDL; v. 26(5); p. 597-606

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