Experimental investigation of anodized/ spray pyrolysed nanoporous structure on heat transfer augmentation

Abstract

This paper analyzes the effects of nanoporous surface on heat transfer temperaments of assorted thermal conducting materials. A phenomenal proposal of wielding the surface roughness to ameliorate the heat transfer rate has been discovered. The maximum increase of heat transfer rate procured by nanoporous layers is 133.3% higher than the polished bare metals of surface roughness 0.2 μm. This plays an imperative role in designing compact refrigeration systems, chemical and thermal power plants. Experimental results picture a formidable upswing of 58.3% heat transfer in chemically etched metals of surface roughness 3 μm, 133.3% in nanoporous surface of porosity 75−95 nm formed by electrochemical anodization, and porosity of 40−50 nm formed by spray pyrolysis increases the heat transfer by 130%. Effects of porosity, flow velocity and scaling on the energy transfer are also scrutinized. This paper also analyzes the multifarious modes of nanoporous fabrication, to contrive both prodigious and provident system.

Boiling Heat Transfer Evaluation in Nanoporous Surface Coatings

“…In this study, the authors collected test results from several sources in the literature [14,16,[18][19][20][21][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. These works report the pool boiling performance of different working fluids such as water, dielectric liquids, and liquid nitrogen subject to different types of nanoporous coated surfaces.…”

“…Range of the considered parameters[14,16,[18][19][20][21][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39].…”

Design and development of three test facilities to evaluate heat transfer performances of advanced and low cost materials and coatings for geothermal application

“…Heat transfer surface can be modified through roughening, texturing, nano structured coating and controlling the surface chemistry. The commonly formed structures using nano structured coatings are nano-porous and nano-finned structures [2]. Generally, nanostructured surface coating is the most preferred method due to the following four reasons [3]:…”