Impact of oxidation on pool boiling heat transfer performance over flat plates exposed to extended operating conditions

Name: Impact of oxidation on pool boiling heat transfer performance over flat plates exposed to extended operating conditions
Author: Emir, Tolga, Budaklı, Mete, Arık, Mehmet

İsim	Impact of oxidation on pool boiling heat transfer performance over flat plates exposed to extended operating conditions
Yazar	Emir, Tolga, Budaklı, Mete, Arık, Mehmet
Basım Tarihi:	2023
Basım Yeri	- IEEE
Konu	Critical heat flux, Dielectric liquids, Heat transfer, Pool boiling, Surface oxidation
Tür	Belge
Dil	İngilizce
Dijital	Evet
Yazma	Hayır
Kütüphane:	Özyeğin Üniversitesi
Demirbaş Numarası	979-835032166-1
Kayıt Numarası	bc429c09-21d8-43dd-b7d3-131986f26133
Lokasyon	Mechanical Engineering
Tarih	2023
Notlar	Deutsche Forschungsgemeinschaft
Örnek Metin	Phase change heat transfer is utilized in a number of high heat flux applications. In order to ensure reliable functionality at moderate temperatures, one has to guarantee a stable long-term operation. In this experimental study, boiling heat transfer (BHT) performances of several substrates under continuous operation at pre-determined heat fluxes were studied. Tests were performed on bare copper surfaces in saturated deionized (DI) water and HFE-7100 under atmospheric conditions. Measurements were conducted at heat fluxes of 30 W/cm2 and 60 W/cm2 for DI water, whereas at 6 W/cm2 and 12 W/cm2 for HFE-7100. In order to identify the temporal change in surface conditions for each substrate, subsequently repeated heating tests were conducted before a 24-hour operation at constant heat flux. Besides the computation of heat transfer coefficients, contact angle (CA) measurements, high-resolution microscopic images, and scanning electron microscope (SEM) analyses were carried out to characterize the impact over surfaces. Microscopic images showed that the use of DI water leads to an intensified oxidization on the test surface. HFE-7100 does not allow oxide layer formation on the copper surfaces. Critical heat flux (CHF) at the surface operated only at 60 W/cm2 in DI water increased, while the boiling curves shifted to the left by decreasing surface temperatures over time. The surfaces immersed in HFE-7100 showed a great consistency with preliminary tests on heat transfer and repeatability tests.
DOI	10.1109/ITherm55368.2023.10177579

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Impact of oxidation on pool boiling heat transfer performance over flat plates exposed to extended operating conditions

Yazar Emir, Tolga, Budaklı, Mete, Arık, Mehmet

Basım Tarihi 2023

Basım Yeri - IEEE

Konu Critical heat flux, Dielectric liquids, Heat transfer, Pool boiling, Surface oxidation

Tür Belge

Dil İngilizce

Dijital Evet

Yazma Hayır

Kütüphane Özyeğin Üniversitesi

Demirbaş Numarası 979-835032166-1

Kayıt Numarası bc429c09-21d8-43dd-b7d3-131986f26133

Lokasyon Mechanical Engineering

Tarih 2023

Notlar Deutsche Forschungsgemeinschaft

Örnek Metin Phase change heat transfer is utilized in a number of high heat flux applications. In order to ensure reliable functionality at moderate temperatures, one has to guarantee a stable long-term operation. In this experimental study, boiling heat transfer (BHT) performances of several substrates under continuous operation at pre-determined heat fluxes were studied. Tests were performed on bare copper surfaces in saturated deionized (DI) water and HFE-7100 under atmospheric conditions. Measurements were conducted at heat fluxes of 30 W/cm2 and 60 W/cm2 for DI water, whereas at 6 W/cm2 and 12 W/cm2 for HFE-7100. In order to identify the temporal change in surface conditions for each substrate, subsequently repeated heating tests were conducted before a 24-hour operation at constant heat flux. Besides the computation of heat transfer coefficients, contact angle (CA) measurements, high-resolution microscopic images, and scanning electron microscope (SEM) analyses were carried out to characterize the impact over surfaces. Microscopic images showed that the use of DI water leads to an intensified oxidization on the test surface. HFE-7100 does not allow oxide layer formation on the copper surfaces. Critical heat flux (CHF) at the surface operated only at 60 W/cm2 in DI water increased, while the boiling curves shifted to the left by decreasing surface temperatures over time. The surfaces immersed in HFE-7100 showed a great consistency with preliminary tests on heat transfer and repeatability tests.

DOI 10.1109/ITherm55368.2023.10177579