Experimental Data Acquisition System for Flow Boiling in Mini Channels

Abstract:

The study discusses experiments on ethanol flow boiling in mini-channels. Pre-set thermal and flow parameters (pressure and temperature at the inlet, mass flux, the heat flux delivered to the heater) and temperature, pressure and void fraction measurements obtained in the experiment provided data for further simulation computations. On the basis of high-speed camera images, void fraction in the mini-channel was determined. Thermograms of the heater surface and the surface in the adiabatic part of the mini-channel allowed producing temperature profiles along the channel length. The read and computed parameters satisfy the expected dependences (especially that for void fraction as a function of volume flux and heat flux). Those were used to solve inverse heat conduction problems.

• Periodical: Applied Mechanics and Materials (Volume 797)
• Pages: 263-273
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.797.263
• Online since: November 2015
• Authors: Mirosław Grabowski, Mieczysław Poniewski, Sławomir Alabrudziński, Krzysztof Płaczkowski
• Keywords: Flow Boiling, Mini Channel, Two-Phase Flow Structures, Void Fraction

References

[1] J. Wernik, K.J. Wołosz, Numerical Simulations and Research of Heat Transfer in Pneumatic Pulsator, International Journal of Nonlinear Sciences and Numerical Simulation, vol. 16, 2015, pp.157-160, DOI: 10. 1515/ijnsns-2014-0012.

DOI: 10.1515/ijnsns-2014-0012

[2] S. Hożejowska, M.E. Poniewski, Application of adjustment calculus to the Trefftz method for calculating temperature field of the boiling liquid flowing in a minichannel, Int. J. of Numerical Methods for Heat and Fluid Flow, vol. 24 (2014).

DOI: 10.1108/hff-01-2013-0022

[3] R. Kaniowski, M.E. Poniewski, Measurements of two-phase flow patterns and local void fractions in vertical rectangular minichannel, Archives of Thermodynamics, vol. 34 (2013), no. 2, pp.1-19.

DOI: 10.2478/aoter-2013-0007

[4] Technical report on the implementation of the NCN research project - N N512 477339 – Analysis of heat and momentum transfer in the liquid flow boiling in mini-/micro-channels with different spatial orientation (in Polish) (2015).

[5] S. Witczak Flow boiling of natural refrigerants inside conventional size channel and minichannels (in Polish), Opole University of Technology (2013).

[6] S. Hożejowska, M. Grabowski, A combined experimental-numerical approach for two-phase flow boiling in a minichannel. Proc. Int. Conf. EFM 2015, Prague (in press).