Prediction of correlation between two-phase natural circulation flows in heated and unheated channels of a parallel channel system – based on electrical analogy
-
H. P. Vyas
Abstract
A common characteristic of many industrial two-phase natural circulation systems is the presence of a large number of parallel boiling channels. Sensitivity of the steady state behavior of such a two-phase natural circulation system to different system parameters has many implications vis-à-vis performance of the system as per the design intent under various operating conditions. Experimental studies were carried out, to study the characteristics of a low pressure two-phase natural circulation system having ten transparent parallel channels with their individual heat sources. In view of its particular significance in nuclear industry, a special system condition with zero power in one of the parallel channels was also studied. The flow in the unheated channel and that in the heated channels were observed to be strongly interdependent in their sensitivity to downcomer resistance. A simple theory based on electrical analogy has been developed to predict the hydraulic behavior in such a system. Agreement between the theoretical predictions and the experimental observations has been found to be good. This article describes the experimentally observed phenomenon, the electrical analogy and the comparison between the experimental data and the analogical predictions.
Kurzfassung
Ein gemeinsames Merkmal vieler industrieller zweiphasigen Naturumlaufsysteme ist das Vorhandensein einer großen Anzahl von parallelen Kanälen, in den Sieden stattfindet. Das stationäre Verhalten eines solchen zweiphasigen Naturumlaufsystems hängt von vielen Betriebsbedingungen ab. Experimentelle Studien wurden durchgeführt, um die Eigenschaften eines Niederdruck-Zweiphasen-Naturumlaufsystem mit zehn transparenten parallelen Kanälen mit unterschiedlichen Wärmequellen zu untersuchen. Auch der Systemzustand „Null-Leistung“ in einem der Kanäle wurde untersucht. Die Strömungen in dem einen unbeheizten und den übrigen beheizten Kanälen sind direkt voneinander abhängig. Eine einfache Theorie basierend auf elektrischer Analogie wurde entwickelt, um das hydraulische Verhalten eines solchen Systems vorherzusagen. Dabei wurde eine gute Übereinstimmung zwischen den theoretischen Vorhersagen und den experimentellen Beobachtungen erzielt.
References
1 Sinha, R. K.; Kakodkar, A.: Design and development of the AHWR – the Indian thorium fuelled innovative nuclear reactor. Nuclear Engineering and Design, 236 (2006) 683–70010.1016/j.nucengdes.2005.09.026Suche in Google Scholar
2 Chatterjee, B.; Srivastava, A.; Lele, H. G.; Mukhopadhyay, D.; Gupta, S. K.; Venkat Raj, V.: Reactor channel behavior of a natural convection based multi channel advanced boiling water reactor. International Symposium on Recent Trends in Heat and Mass Transfer, 6–8 January 2002, Guwahati, IndiaSuche in Google Scholar
3 Kumar, M.; Lele, H. G.; Ghosh, A. K.; Kushwaha, H. S.: Study of thermal hydraulic behavior on power defueling-refueling operation for natural circulation reactor. 7th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, Operation and Safety, Seoul, Korea, October 5–9, 2008Suche in Google Scholar
4 Chato, J. C.: Natural convection flows in parallel-channel systems. Journal of Heat Transfer, November 1963, 339–34510.1115/1.3686122Suche in Google Scholar
5 Vyas, H. P.; Venkat Raj, V.: Development of an experimental set up and studies on natural circulation flow distribution in a parallel channel system. 33rd National and 3rd International Conference on Fluid Mechanics and Fluid Power, Indian Institute of Technology Bombay, December 7–9, 2006, Mumbai, IndiaSuche in Google Scholar
6 Aparna, J.; Vyas, H. P.; Sharma, V. S. V. G.; Rupani, B. B.; Venkat Raj, V.: Design and development of experimental measurement and analysis methods for the natural circulation flow distribution studies in transparent parallel channels. 33rd National and 3rd International Conference on Fluid Mechanics and Fluid Power, Indian Institute of Technology Bombay, December 7–9, 2006, Mumbai, IndiaSuche in Google Scholar
7 Vyas, H. P.; Venkat Raj, V.; Nayak, A. K.: Experimental investigations on steady state natural circulation behavior of multiple parallel boiling channel system. Nuclear Engineering and Design, 240 (2010) 3862–386710.1016/j.nucengdes.2010.09.002Suche in Google Scholar
8 Hoffer Flow Controls, Inc.: HO series turbine flowmeters for liquid service. Product Bulletin HO-L-110I, 2006Suche in Google Scholar
9 Yokogawa Electric Corporation: General specifications GS 01C21B01-00E for differential pressure transmitter Model EJA110A. June 1997Suche in Google Scholar
10 Fuji Electric France S.A. : Differential pressure (flow) transmitter data sheet FKC. FDC-4; September 2002Suche in Google Scholar
11 Eurotherm Limited: Paperless graphic recorders models 6100A, 6180A. Specification sheet, August 2008Suche in Google Scholar
12 Instrument Society of America: ISA-S75.01-1985, Flow equations for sizing control valves. 1985.Suche in Google Scholar
© 2014, Carl Hanser Verlag, München
Artikel in diesem Heft
- Contents/Inhalt
- Contents
- Summaries/Kurzfassungen
- Summaries
- Technical Contributions/Fachbeiträge
- Simulation of thermal fluid dynamics in parabolic trough receiver tubes with direct steam generation using the computer code ATHLET
- Measurement of velocity profiles of nanofluids in laminar channel flow using Particle Image Velocimetry
- Prediction of correlation between two-phase natural circulation flows in heated and unheated channels of a parallel channel system – based on electrical analogy
- Investigation of (n,γ) reactions in fissionable fluids in a hybrid reactor system
- In-pile modelling of nuclear fuel element for the MTR type reactors – Part 2
- One-step synthesis of Pt-reduced graphene oxide composites based on high-energy radiation technique
- Hamming generalized corrector for reactivity calculation
- Experimental study of flow inversion in MTR upward flow research reactors
- Technical Note
- The effect of burn up on the kinetic parameters for a pressurized water reactor fueled by MOX using MCNPX code
- Diffusion length calculations for one-speed neutrons in a slab with backward, forward and linear anisotropic scattering
- Improvement of passive shielding to reduce background components to determinate radioactivity at low energy gamma rays
- A study of the energy enhancement of electron in radio frequency (RF) linear accelerator of iris loaded waveguards
- Age-dependent effective doses for radionuclides uniformly distributed in air
Artikel in diesem Heft
- Contents/Inhalt
- Contents
- Summaries/Kurzfassungen
- Summaries
- Technical Contributions/Fachbeiträge
- Simulation of thermal fluid dynamics in parabolic trough receiver tubes with direct steam generation using the computer code ATHLET
- Measurement of velocity profiles of nanofluids in laminar channel flow using Particle Image Velocimetry
- Prediction of correlation between two-phase natural circulation flows in heated and unheated channels of a parallel channel system – based on electrical analogy
- Investigation of (n,γ) reactions in fissionable fluids in a hybrid reactor system
- In-pile modelling of nuclear fuel element for the MTR type reactors – Part 2
- One-step synthesis of Pt-reduced graphene oxide composites based on high-energy radiation technique
- Hamming generalized corrector for reactivity calculation
- Experimental study of flow inversion in MTR upward flow research reactors
- Technical Note
- The effect of burn up on the kinetic parameters for a pressurized water reactor fueled by MOX using MCNPX code
- Diffusion length calculations for one-speed neutrons in a slab with backward, forward and linear anisotropic scattering
- Improvement of passive shielding to reduce background components to determinate radioactivity at low energy gamma rays
- A study of the energy enhancement of electron in radio frequency (RF) linear accelerator of iris loaded waveguards
- Age-dependent effective doses for radionuclides uniformly distributed in air
