Year: 2013
Type: conference-paper
Abstract: In this work, heat transfer surface modification is made by layers of carbon nanofiber (CNF) on 50µm nickel wire using a chemical vapor deposition process (CVD).Three different CNF layer morphologies are made, at 500˚C, 600˚C and 700˚C, to investigate their influence on heat transfer performance characteristics.Moreover, the influence of the CNFs layer thickness on each batch of morphology is studied.Experimental results shows that samples made at 500˚C creates an insulating layer of CNFs, which is attributed to the dense structure of the layer of fibers, resulting in 25% lower heat transfer compared to the heat transfer performance of the bare wire.However, samples made at 600˚C, exhibit relatively open layer of CNFs and lower thermal conductivity compared to samples made 500˚C, resulting in an enhancement of 24%.This is because the relative open structure leads to relatively better flow permeability which increases the heat transfer surface area.Samples made at 700˚C are partly covered with dense CNFs layer and partly with amorphous layer of carbon.Heat transfer enhancement of 34% is achieved which is attributed to the rough surface created by the carbon nano structures.
Authors: T.J. Taha, Theodorus H. van der Meer
Language: English
Topic: Heat Transfer Mechanisms
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2287183958