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Saturday, August 1, 2020 | History

2 edition of criterion for the onset of quench for low flow reflood found in the catalog.

criterion for the onset of quench for low flow reflood

Y. Y Hsu

criterion for the onset of quench for low flow reflood

by Y. Y Hsu

  • 55 Want to read
  • 16 Currently reading

Published by Division of Accident Evaluation, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission in Washington, D.C .
Written in English

    Subjects:
  • Pressurized water reactors -- Emergency core cooling systems,
  • Nuclear reactors -- Cooling

  • Edition Notes

    StatementY.Y. Hsu, M.W. Young
    ContributionsYoung, Michael W, U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Experimental Programs Branch
    The Physical Object
    Pagination28 p. in various pagings :
    Number of Pages28
    ID Numbers
    Open LibraryOL14948047M

    The MacBeth CHF correlation is separated for low flow conditions and high flow conditions. At low flow conditions, the correlation defines the critical heat flux as: (39) where is the critical heat flux (MBtu/hr-ft), is the hydraulic diameter, based on wetted perimeter (in), is the latent heat of vaporization (Btu/lbm), is the mass velocity. the quench curve for surface temperatures below ~ C. Heat transfer measurements were made locally in the spray field using a heater surface area of cm 2. -Onset of Nucleate Boiling (ONB), qi I/ Wall Superheat log ATso t Accurate volumetric flow rate measurement at both low and high flow .

    Water provides a very sudden, drastic quench which can result in a very hard steel, but also internal stresses, distortion, or cracking. Water is especially used for what type of steel and why? low-carbon steel because this type of steel requires a very rapid change in temperature in order to obtain good hardness and strength. the quench tank, virtually no agitation was present, and lower properties would be observed. This analysis, conducted in , is probably the first CFD analysis of a quench tank, and showed the power of CFD. Figure 4 – Quench tank used for determining proper concentration of polyalkylene-glycol quenchants for quenching aluminum for AMS

    This criterion is a conceptually more rational limit than both the flow length and the product iL (where i is the rainfall intensity) because it incorporates main properties of sheet flow. Also, the criterion nL/ (S can differentiate a feet flow length with a steep slope and low Manning’s n and the same length with a flat slope and high. Quench time is a measure of how long a steel casting spends at high temperature during quenching. While castings cool, the quench water warms; therefore, there is a one-to-one relationship between the two. This fact allows average casting temperatures to be estimated from a measurement of quench water temperature alone and a knowledge of.


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Criterion for the onset of quench for low flow reflood by Y. Y Hsu Download PDF EPUB FB2

Get this from a library. A criterion for the onset of quench for low flow reflood. [Y Y Hsu; Michael W Young; U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research.

Division of Accident Evaluation.]. Low flow rates (QUENCH,). in the lower plenum was started to maintain a nearly stable level and a constant steam flow until the onset of reflood. The test section reflood was initiated at a maximum measured bundle temperature of K (at s), by a quench water flow of 18 g/s at K, few tens of seconds after the start of Cited by: 2.

The quenched-flow method is a chemical sampling method used in the milliseconds to seconds time range. Experiments are carried out in especially constructed apparatus in which the enzyme and substrate(s) are mixed, the reaction mixtures aged for milliseconds to tens of seconds, and the reaction stopped (quenched) by a suitable agent, typically.

Rapid-quench kinetic analysis has become the method of choice for examination of enzyme reaction pathways. The KinTek RQF-3 Quench-Flow Instrument enables the most definitive experiments to be performed most efficiently, preserving precious biological samples and providing accurate, reliable on: Sandia Loop, Suite C Austin, TX, United States.

Flow and heat transfer in pressurized water reactor reflood Article (PDF Available) in Multiphase Science and Technology 22(4) January with 1, Reads How we measure 'reads'.

One of the ultimate goals of QUENCH is to identify the limits (temperature, injection rate, etc.) for which successful reflood and quench can be achieved, and thus address one of the issues concerned with in-vessel coolability during a Beyond Design Basis Accident (BDBA) (Birchley et al., ).In some situations air ingress scenarios may occur: during a severe accident the reactor.

The main component of the QUENCH test facility is the test section with the test bundle (Fig. The test section has a separate inlet at the bottom to inject water for reflood (bottom quenching).

The argon, the steam not consumed, and the hydrogen produced in the zirconium-steam reaction flow from the bundle outlet at the top through a. A heat transfer experiment was performed on steam-water two-phase flow in an annular flow path with a uniformly heated rod under the conditions of the mass flow rates from O.2×l06 to ×l06kg.

A CRITERION for preventing quench cracks has not been established although many investigations have been conducted for this purpose. Some studies on the quench cracking were reviewed in the texts [1, 2]. Some researchers have indicated that tensile stresses may contribute to quench.

The tests Quench and Quench were characteristic of the lower reflooding onset temperature (– K), and the tests Quench and Quench had high reflooding onset temperature (> K) with the fast heat-up phase before reflooding.

Quench Flow. Small volumes of solutions are driven through a high efficiency mixer and flow into a delay (or ageing) loop.

After a set time, the reaction is stopped (or quenched) by the addition of a chemical quench solution. This age time is controlled by the speed and duration of a single push, or by two pushes with a variable delay between them.

A basic chemical quench-flow allows the mixing of two reactants, followed (after a specified time interval) by quenching with a chemical agent (usually acid or base). A drive motor is used to force reactants contained in drive syringes together into a mixer after which the mixed reactants pass into a reaction delay line.

flow in quench chambers, furnaces, and their components, and cooling of single and multi-body quench charges is presented, with emphasis on the fluid mechanics and heat transfer aspects. The state of the art can also be found in the citations contained in the quoted references.

Flow inside quench chamber and their components The flow then moves upward and leaves the quench section through two outlets. The temperature and pressure of the incoming flow are K and 3 atm, respectively. There are two injection locations: the primary one is located near the entrance of the quench section in the main flow chamber and another set of eight injectors serve.

Quench-Induced Degradation of the Quality Factor in Superconducting Resonators geted a criterion for the amount of flux trapped during the quench. A clear dependence of the quench-related degra- low as possible, and the cavity is quenched again several times [points with “0” field labels in Fig.

3(a)]. measurement of heat flow, it is often called heat flow DSC. A Boersma DTA can also be used to calculate heat flow with the right calibrations and is also used for the DSC technique. This is accomplished by measuring temperature differences and changes between a sample and a refer-ence, or the heat flux.

These instruments are sometimes. connected to the quench tube. The water in the balance tank can be heated and is continuously circulated through the quench cylinder. Steam flow rates up to 2 g/s are used in the experiments with rapid steam cooling.

The inductive heating of the specimen is terminated at the onset. Y Hsu has written: 'A criterion for the onset of quench for low flow reflood' -- subject(s): Cooling, Nuclear reactors, Emergency core cooling systems, Pressurized water reactors. and subcooling. The quench velocity and rewetting temperature were found to decrease for RI13 but only showed very slight decreases for PF in reduced gravity.A peak in the liquid-solid contact frequency curve was found at wall superheats of - 1 18 OC for R and 65 - 83 OC for PF in both gravity maximum heat flux for both fluids.

quench tank attributable to the cooling water (T •) is given by: Eq. 1 where m • is the cooling water flow rate, M W is the mass of quench water, T CW is the cooling water temperature as it enters the tank, and Tis the tank tem-perature.

The cooling water flow rate is usually known, but if not, it can be estimated from the data. At the end of. Pressure Quench of Flow-Induced Crystallization Precursors Zhe Ma, Luigi Balzano, and Gerrit W. M. Peters Macromolecules 45 (10), ON QUENCH PROPAGATION, QUENCH DETECTION AND SECOND SOUND IN SRF CAVITIES R.

Eichhorn# and S. Markham Cornell Laboratory for Accelerator-Based Sciences and Education, Cornell University Ithaca, NYUSA Abstract The detection of a second sound wave, excited by a quench, has become a valuable tool in diagnosing hot.3.

The effect of bundle geometry on reflood heat transfer is minimal as long as generated power and stored energy per unit flow area is similar. 4. The flow regime ahead of the quench front is characterized by a froth region.

An assumption of steam cooling heat transfer above the quench front for reflood rates is not appropriate.