Experimental study of pool boiling heat transfer on horizontal metallic foam surface with crossing and single-directional V-shaped groove in saturated water

Comparative experimental study on pool boiling performance of porous coating and solid structures with reentrant channels

“…They are powered by a variac and monitored by a powermeter. The test sample is welded on top of the copper block using a high-conductive solder (Pb-Sn-Ag-Sb, ks=50W/m·K), and the contact thermal resistance is considerably eliminated [11,25]. The bottom surface of test sample is leveled to the lowest line of liquid pool, and all the sample surfaces except the bottom one are exposed to liquid.…”

“…The reentrant channels also provide sufficient liquid supply to sustain the cycles of bubble nucleation, growth and expulsions. The latent energy induced by the large wall [11,22,25,41], in which the heat transfer curves declined quickly after reaching the peak, and rapidly approached the critical heat fluxes (CHF).…”

“…Li et al [24] fabricated a hybrid modulated porous structures with porous base and circular vertical porous pillars, and found that the horizontal liquid replenishing played an important role on the pool boiling heat transfer enhancement and CHF improvement. Moreover, Qu et al [25] experimentally studied the heat transfer enhancement by cutting with single-directional and crossing V-shaped channels inside the porous metal foam layers. Recently, Jaikumar and Kandlikar [26] prepared sintered porous coatings in three different ways above the rectangular microchannels, i.e., entire microchannel surface (sintered-throughout), only the fin tops (sintered-fin-top), and only the channel walls (sintered-channel).…”

Nucleate Pool Boiling Heat Transfer on a Micro-Pin-Finned Surface in Short-Term Microgravity

“…Until now, many kinds of microstructures have been observed, such as microstructured [8], diamond particle [9], micro-re-entrant cavities [10], porous surfaces [11], carbon nanotubes [12], nanowires arrays [13], octagonal micro-posts, or ZnO nanorods, or both [14], Cu micro-porous surface layers [15] micro-fin arrays covered with porous structure [16], microstructured surfaces with a wide range of well-defined surface roughness [17] and metallic foam surface with crossing and single-directional V-shaped groove [18]. These surfaces can actually enhance boiling heat transfer by increasing nucleate site number and effective boiling heat transfer surface area.…”

Low-GWP refrigerants flow boiling heat transfer in a 5 PPI copper foam

“…The pool boiling on metal foams was studied by several Authors, amongst those: Athreya et al (2002), Moghaddam and Ohadi (2003), Coursey et al (2005), Xu et al (2008), Yang et al (2010), Ji et al (2011), Jin et al (2011), Zhu et al (2011), Pranoto et al (2012, Qu et al (2012), and Zhao (2013, 2014).…”