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Tuesday, July 21, 2020 | History

2 edition of Influence of increasing hydrogen concentration on the heat transfer phenomena during voildown. found in the catalog.

Influence of increasing hydrogen concentration on the heat transfer phenomena during voildown.

I. Shepherd

Influence of increasing hydrogen concentration on the heat transfer phenomena during voildown.

by I. Shepherd

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Published by Commission of the European Communities in Luxembourg .
Written in English


Edition Notes

SeriesNuclear science and technology
ContributionsCommission of the European Communities. Directorate-General for Science, Research and Development.
ID Numbers
Open LibraryOL14934942M
ISBN 10011939698X

heat transfer media. In this book, we will see many examples of processes where the rates of heat transfer, mass transfer and chemical reaction between two phases depend on the fluid flow phenomena in the system. It is therefore necessary to start our study of rate phenomena in processing systems by examining the motion of Size: KB. @article{osti_, title = {Some factors which affect the rate of oxidation and hydrogen absorption of Zircaloy-2 in steam}, author = {Cox, Brian}, abstractNote = {Data, which were accumulated over several years, on the effect of a number of variables on the oxidation and hydriding of Zircaloy-2 are presented. The use of this information to eliminate some of the inaccuracies in present.

  Experimental studies of heat transfer and flow regimes during flow boiling of water and alumina nanofluids at different heat and mass fluxes 7 August | Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, Vol. , No. Cited by: High frying temperature, the number of fryings, the contents of free fatty acids, polyvalent metals, and unsaturated fatty acids of oil decrease the oxidative stability and flavor quality of oil. Antioxidant decreases the frying oil oxidation, but the effectiveness of Cited by:

Combustion of Two-Phase Reactive Media (Heat and Mass Transfer) - Kindle edition by Yarin, L. P., Hetsroni, G., Mosyak, A.. Download it once and read it on your Kindle device, PC, phones or tablets. Use features like bookmarks, note taking and highlighting while reading Combustion of Two-Phase Reactive Media (Heat and Mass Transfer).Cited by:   36 ANALOGY (SIMILARITY) BETWEEN HEAT AND MASS TRANSFER We can develop an understanding of mass transfer in a short time with little effort by simply drawing parallels between heat and mass transfer. Temperature The driving force for mass transfer is the concentration .


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Influence of increasing hydrogen concentration on the heat transfer phenomena during voildown by I. Shepherd Download PDF EPUB FB2

The influence of hydrogen fraction on the heat transfer behavior of the Bunsen flame is further examined by measuring the local heat flux in radial direction, starting from the stagnation point, at several constant nozzle-to-plate distances.

The radial distributions of the local heat flux obtained for α = 0% and α = 50% are shown in Fig. by: This paper describes an experimental study of the effect of hydrogen concentration on the emission and heat transfer characteristics of a laminar premixed LPG-hydrogen flame.

Hydrogen gas dissolved in liquids will permeate into adjoining vessel materials. At elevated temperatures and pressures, hydrogen attacks mild steels severely, causing decarburization and embrittlement.

This is a serious concern in any situation involving storage or transfer of hydrogen gas File Size: 1MB. In this paper, a numerical investigation of two-dimensional coupled heat and mass transfer during desorption of hydrogen in a cylindrical metal hydride reactor containing MmNiAl is presented.

(ii) Effect of radiative heat transfer is negligible. This assumption is valid for all Mm, La, Zr and Ti based alloys whose minimum absorption temperatures are well below 30 C. (iii) The gas phase is ideal from thermodynamic point of view.

(iv) Only mass transfer and no heat transfer. The fixed-gas drag force from a model calculation method that stabilizes the agitation capabilities of different gas ratios was used to explore the influence of temperature and hydrogen concentration on fluidizing duration, metallization ratio, utilization rate of reduction gas, and sticking behavior.

Different hydrogen concentrations from 5vol% to vol% at and K were used Cited by: 9. PROBLEM KNOWN: Thermal conductivity, thickness and temperature difference across a sheet of rigid extruded insulation.

FIND: (a) The heat flux through a 2 m x 2 m sheet of the insulation, and (b) The heat rate through the sheet. SCHEMATIC: A = 4m 2 k = ASSUMPTIONS: (1) One-dimensional conduction in the x-direction, (2) Steady- state. Discuss the heating curve for water.

A heating curve graphically represents the phase transitions that a substance undergoes as heat is added to it. The plateaus on the curve mark the phase changes. The temperature remains constant during these phase transitions. Water has a high boiling point because of the strong hydrogen bonds between the.

transfer of heat through or between solids that are in direct contact. conduction results from increased molecular motion and collisions between the molecules of a substance resulting in the transfer of energy through the substance. heat transfer due to conduction is dependent upon.

SUMMARY. The search of a solution for Fourier's partial derivative equation relative to the phenomena of conductive heat transfer may be advantageously replaced, in using a variational principle, by the problem of the minimalisation of a functional which takes into account the imposed boundary conditions.

Hydrogen ion reacted with the bicarbonate ion in a straightforward way to produce water and carbon dioxide. The carbon dioxide migrates to gas nuclei in the batter and expands as it is heated, increasing the volume of the baking product. Figure 1 shows the pH evolution of four types of cakes during Size: KB.

Hydrogen embrittlement causes a crack initiation and brittle fracture. Therefore, it is important to conduct theoretical analysis to predict hydrogen distribution on the basis of reasonable physical model.

In this paper, numerical analysis on the hydrogen diffusion and concentration at the localized stress field was conducted to clarify the behavior of hydrogen concentration and the Cited by: 2.

Creating a vacuum will stop radiant heat. Light materials emit and absorb heat more effectively than dark materials.

Temperature differences between the heat source and exposed surface have no impact. Increasing distance between the heat source and exposed surfaces reduces the effect of radiant heat. Full text of "Hydrogen Ion Concentration Vol I" See other formats.

The heat-transfer results are presented and correlated by modified Dittus­ Boelter equations with hydrogen gas properties evaluated at the bulk, film, and surface temperatures. The data fell within about ±20 percent of the correlating equations.

The heat-transfer results agreed with those obtained from a parallel-flat-plate testFile Size: 2MB. This paper presents, the numerical analysis of heat and mass transfer during hydrogen generation in an array of fuel cylinder bars, each coated with a cladding and a steam current flowing outside the cylinders.

The analysis considers the fuel element without mitigation effects. The system consists of a representative periodic unit cell where the initial and boundary-value problems for heat and Cited by: 2. In reality this is a combination of diffusion and bulk motion of molecules.

Near the surface the fluid velocity is low, and diffusion dominates. At distance from the surface, bulk motion increases the influence and dominates. Convective heat transfer can. Hydrogen concentration behavior of y-grooved weld joint based on a coupled analysis of heat transfer - thermal stress - hydrogen diffusion Go Ozeki 1*, A.

Toshimitsu Yokobori 1, Toshihito Ohmi 2, Tadashi Kasuya 3, Nobuyuki Ishikawa 4, Satoshi Minamoto 5, Manabu Enoki 3Author: Go Ozeki, A. Toshimitsu Yokobori, Toshihito Ohmi, Tadashi Kasuya, Nobuyuki Ishikawa, Satoshi Minamot. Each of these mechanisms relies on the property of heat to flow from a higher concentration to a lower concentration; therefore, each of the mechanisms of heat exchange varies in rate according to the temperature and conditions of the environment.

Conduction is the transfer of heat by two objects that are in direct contact with one another. ), hydrogen (H), nitrogen (N), oxygen (O), water vapor (2. H O), and other various hydrocarbons (C H.

n n). When you vary the proportions of air and fuel in a fuel-fired furnace, you can provide three distinct atmospheres: oxidizing, reducing, and neutral.

STAGES of HEAT TREATMENT. You accomplish heat treatment in three major stages. This is due to transfer of heat energy from molecule to molecule or from atom to atom. Also, when objects are welded together, the metal becomes hot (the orange-red glow) by the transfer of heat from an arc.

This is called conduction and is a very effective method of heat transfer in metals. However, air conducts heat poorly. Convection.Where q is the heat transferred by radiation, E is the emissivity of the system, σ is the constant of Stephan-Boltzmann ( x 10^-8 W/m^2.K^4), A is the area involved in the heat transfer by radiation, and (ΔT)^4 is the difference of temperature between two systems to the fourth or higher power.Heat transfer mechanisms of laminar flames of hydrogen+oxygen Increasing the heat transfer from premixed laminar oxy-fuel flames to glass or quartz products is of major importance in the lighting industry.

In this paper a laminar flame of hydrogen +oxygen is used as an impinging crucial heat transfer phenomena to formulate new de.