Effect of heated zone size on micro and nanoscale convective heat transfer

R. A. Pulavarthy, M. T. Alam, M. A. Haque

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Recent studies on free convective heat transfer from micro and nanoscale structures show that the heat transfer coefficient is size dependent. The heat transfer coefficient is found to increase at smaller scales, which is ascribed to the higher surface area to volume ratio. Also, the mode is changed from advection to conduction due to the decaying influence of the gravitational field. Interestingly, it is tacitly assumed that the size effect is due to the specimen, since not a single study on the effect of the size of heat source on the convective heat transfer exists in the literature. In this study, we provide unambiguous experimental evidence of the predominance of heater size on the heat transfer coefficient. For micro-heaters, the heat transfer coefficient is measured to about 3200W/m2K. This value drops to about 110W/m2K for a millimeter scale heater and to 10W/m2K for a macroscopic heater; all for a nanoscale thin film specimen. This finding is particularly significant in microelectronic applications where localized heating (hot spots) in small areas is very common.

Original languageEnglish (US)
Pages (from-to)56-60
Number of pages5
JournalInternational Communications in Heat and Mass Transfer
Volume52
DOIs
StatePublished - Mar 1 2014

Fingerprint

convective heat transfer
heat transfer coefficients
heaters
Heat transfer coefficients
Heat transfer
Advection
heat sources
advection
microelectronics
Microelectronics
gravitational fields
Heating
conduction
Thin films
microstructure
heating
thin films

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Chemical Engineering(all)
  • Condensed Matter Physics

Cite this

@article{66842f0a59664bb0904dc91cd44e2e9f,
title = "Effect of heated zone size on micro and nanoscale convective heat transfer",
abstract = "Recent studies on free convective heat transfer from micro and nanoscale structures show that the heat transfer coefficient is size dependent. The heat transfer coefficient is found to increase at smaller scales, which is ascribed to the higher surface area to volume ratio. Also, the mode is changed from advection to conduction due to the decaying influence of the gravitational field. Interestingly, it is tacitly assumed that the size effect is due to the specimen, since not a single study on the effect of the size of heat source on the convective heat transfer exists in the literature. In this study, we provide unambiguous experimental evidence of the predominance of heater size on the heat transfer coefficient. For micro-heaters, the heat transfer coefficient is measured to about 3200W/m2K. This value drops to about 110W/m2K for a millimeter scale heater and to 10W/m2K for a macroscopic heater; all for a nanoscale thin film specimen. This finding is particularly significant in microelectronic applications where localized heating (hot spots) in small areas is very common.",
author = "Pulavarthy, {R. A.} and Alam, {M. T.} and Haque, {M. A.}",
year = "2014",
month = "3",
day = "1",
doi = "10.1016/j.icheatmasstransfer.2014.01.016",
language = "English (US)",
volume = "52",
pages = "56--60",
journal = "International Communications in Heat and Mass Transfer",
issn = "0735-1933",
publisher = "Elsevier Limited",

}

Effect of heated zone size on micro and nanoscale convective heat transfer. / Pulavarthy, R. A.; Alam, M. T.; Haque, M. A.

In: International Communications in Heat and Mass Transfer, Vol. 52, 01.03.2014, p. 56-60.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effect of heated zone size on micro and nanoscale convective heat transfer

AU - Pulavarthy, R. A.

AU - Alam, M. T.

AU - Haque, M. A.

PY - 2014/3/1

Y1 - 2014/3/1

N2 - Recent studies on free convective heat transfer from micro and nanoscale structures show that the heat transfer coefficient is size dependent. The heat transfer coefficient is found to increase at smaller scales, which is ascribed to the higher surface area to volume ratio. Also, the mode is changed from advection to conduction due to the decaying influence of the gravitational field. Interestingly, it is tacitly assumed that the size effect is due to the specimen, since not a single study on the effect of the size of heat source on the convective heat transfer exists in the literature. In this study, we provide unambiguous experimental evidence of the predominance of heater size on the heat transfer coefficient. For micro-heaters, the heat transfer coefficient is measured to about 3200W/m2K. This value drops to about 110W/m2K for a millimeter scale heater and to 10W/m2K for a macroscopic heater; all for a nanoscale thin film specimen. This finding is particularly significant in microelectronic applications where localized heating (hot spots) in small areas is very common.

AB - Recent studies on free convective heat transfer from micro and nanoscale structures show that the heat transfer coefficient is size dependent. The heat transfer coefficient is found to increase at smaller scales, which is ascribed to the higher surface area to volume ratio. Also, the mode is changed from advection to conduction due to the decaying influence of the gravitational field. Interestingly, it is tacitly assumed that the size effect is due to the specimen, since not a single study on the effect of the size of heat source on the convective heat transfer exists in the literature. In this study, we provide unambiguous experimental evidence of the predominance of heater size on the heat transfer coefficient. For micro-heaters, the heat transfer coefficient is measured to about 3200W/m2K. This value drops to about 110W/m2K for a millimeter scale heater and to 10W/m2K for a macroscopic heater; all for a nanoscale thin film specimen. This finding is particularly significant in microelectronic applications where localized heating (hot spots) in small areas is very common.

UR - http://www.scopus.com/inward/record.url?scp=84893368598&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84893368598&partnerID=8YFLogxK

U2 - 10.1016/j.icheatmasstransfer.2014.01.016

DO - 10.1016/j.icheatmasstransfer.2014.01.016

M3 - Article

AN - SCOPUS:84893368598

VL - 52

SP - 56

EP - 60

JO - International Communications in Heat and Mass Transfer

JF - International Communications in Heat and Mass Transfer

SN - 0735-1933

ER -