Heat flux determination for nucleate boiling in subsurface tunnel structures

Abstract

The paper focuses on theoretical analysis of boiling heat transfer on surfaces with tunnel structures formed by fins with microfins and covered with perforated foil. The investigations were conducted for water, ethanol and R-123. The theoretical heat flux, based on modified Chien and Webb model, when compared to the experiments, showed satisfying agreement in low and medium ranges for water and ethanol, and in all heat flux ranges for R-123. List of symbols

Impact of selected thermal and flow parameters on flow boiling heat transfer in a minichannel

“…The Kielce University of Technology has conducted a series of studies of flow boiling heat transfer with different refrigerants [4][5][6] flowing along minichannels with enhanced heated plates [4,[7][8][9][10][11][12][13][14] at various orientations [4,15,16]. The use of enhanced surfaces produced in thermal processes is known to intensify the heat transfer process as shown in [7,[17][18][19][20][21] Such surfaces are applied also in pool boiling heat transfer [22][23][24][25][26]. Studies on heat transfer in confined spaces as face seals were described in [27][28][29].…”

Pool boiling of ethanol and FC-72 on open microchannel surfaces

“…Research on pool boiling heat transfer with water, ethanol, FC-72 and Novec-649 from tunnel structures, microfins, microchannels, microcavities [5][6][7][8][9][10] and boiling heat transfer with FC-72 flowing in narrow channels [11][12][13] has been conducted at the Kielce University of Technology for more a decade.…”