A numerical investigation on heat transfer dynamics of a periodically forced boiling channel in low amplitudes
| Autor: | Tanusree Ghoshal, Bitan Mankar, Jyoti Bhati, Swapan Paruya |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Applied Mathematics General Chemical Engineering Heat transfer enhancement 02 engineering and technology General Chemistry Mechanics Critical value 01 natural sciences Instability Industrial and Manufacturing Engineering 010305 fluids & plasmas Harmonic balance 020303 mechanical engineering & transports Amplitude 0203 mechanical engineering Heat flux Boiling 0103 physical sciences Heat transfer |
| Zdroj: | Chemical Engineering Science. 181:326-340 |
| ISSN: | 0009-2509 |
| DOI: | 10.1016/j.ces.2018.02.037 |
| Popis: | In this article, the authors report wall-heat transfer characteristics of a periodically forced vertical boiling channel with the help of numerical simulation based on four-equation drift flux model. The periodic forcing on the boiling channel was initiated by the sinusoidal perturbation of the inlet velocity. The effect of the frequency ω and the amplitude a of the forcing on the heat transfer enhancement were studied to formulate a mechanism for the enhancement of wall heat flux q w ″ . q w ″ increases with a in the range of ω less than a critical value ωcrit. The comparison of the numerical solution and the asymptotic solution of a reduced-order model through harmonic balance method (HBM) shows that both the solutions for the amplitude of exit mixture enthalpy decrease with ω consistently and asymptotically, when ω is greater than the characteristic frequency ωc of the channel. The enhancement is also facilitated by chaotic instability (mixing) at higher a and higher external heat flux. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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