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research-article

EFFECTS OF FEMTOSECOND LASER SURFACE PROCESSED NANOPARTICLE LAYERS ON POOL BOILING HEAT TRANSFER PERFORMANCE

[+] Author and Article Information
Corey Kruse

Department of Mechanical and Materials Engineering
coreykruse_08@hotmail.com

Mike Lucis

Department of Mechanical and Materials Engineering
mlucis@huskers.unl.edu

Jeff Shield

Department of Mechanical and Materials Engineering
jshield@unl.edu

Troy Anderson

Department of Electrical Engineering, University of Nebraska - Lincoln, Lincoln, NE, 68588, United States
tpa@suiter.com

Craig Zuhlke

Department of Electrical Engineering, University of Nebraska - Lincoln, Lincoln, NE, 68588, United States
czuhlke@unl.edu

Dennis Alexander

Department of Electrical Engineering, University of Nebraska - Lincoln, Lincoln, NE, 68588, United States
dalexander1@unl.edu

Professor George Gogos

Department of Mechanical and Materials Engineering
ggogos@unl.edu

Sidy Ndao

Department of Mechanical and Materials Engineering
sndao2@unl.edu

1Corresponding author.

ASME doi:10.1115/1.4038763 History: Received January 18, 2017; Revised November 03, 2017

Abstract

An experimental investigation of the effects of layers of nanoparticles formed during Femtosecond Laser Surface Processing (FLSP) on pool boiling heat transfer performance has been conducted. Five different stainless steel 304 samples with slightly different surface features were fabricated through FLSP and pool boiling heat transfer experiments were carried out to study the heat transfer characteristics of each surface. The experiments showed that the layer(s) of nanoparticles developed during the FLSP processes, which overlay FLSP self-organized microstructures, can either improve or degrade boiling heat transfer coefficients depending on the overall thickness of the layer(s). This nanoparticle layer thickness is an indirect result of the type of microstructure created. The heat transfer coefficients were found to decrease with increasing nanoparticle layer thickness. This trend has been attributed to added thermal resistance. Using a Focused Ion Beam (FIB)milling process and Transmission Electron Microscopy (TEM), the physical and chemical properties of the nanoparticle layers were characterized and used to explain the observed heat transfer results. Results suggest that there is an optimal nanoparticle layer thickness and material composition such that both the heat transfer coefficients and critical heat flux are enhanced.

Copyright (c) 2017 by ASME
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