Measurement of natural convective heat transfer coefficient along the surface of a heated wire using digital holographic interferometry

Varun Kumar, Manoj Kumar, Chandra Shakher

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

In this paper, the local convective heat transfer coefficient (h) is measured along the surface of an electrically heated vertical wire using digital holographic interferometry (DHI). Experiments are conducted on wires of different diameters. The experimentally measured values are within the range as given in the literature. DHI is expected to provide a more accurate local convective heat transfer coefficient (h) as the value of the temperature gradient required for the calculation of "h" can be obtained more accurately than by other existing optical interferometric techniques without the use of a phase shifting technique. This is because in digital holography phase measurement accuracy is expected to be higher.

Original languageEnglish
Pages (from-to)G74-G83
JournalApplied Optics
Volume53
Issue number27
DOIs
StatePublished - 20 Sep 2014
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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