An experimental investigation into frost accumulation over vertical finned and unfinned surfaces during impinging air flow

Name: An experimental investigation into frost accumulation over vertical finned and unfinned surfaces during impinging air flow
Author: Öksüz, Enes Abdülhakim, Saygın, Alper, Başol, Altuğ Melik, Budaklı, M., Arık, Mehmet

İsim	An experimental investigation into frost accumulation over vertical finned and unfinned surfaces during impinging air flow
Yazar	Öksüz, Enes Abdülhakim, Saygın, Alper, Başol, Altuğ Melik, Budaklı, M., Arık, Mehmet
Basım Tarihi:	2020
Basım Yeri	- ASME
Konu	Author keywords, Electronics cooling, Forced convection, Frost, Heat flux, Thermal resistance
Tür	Belge
Dil	İngilizce
Dijital	Evet
Yazma	Hayır
Kütüphane:	Özyeğin Üniversitesi
Demirbaş Numarası	978-079188404-1
Kayıt Numarası	8550ff7e-b5ce-485d-a5d7-e7f95de22fcc
Lokasyon	Mechanical Engineering
Tarih	2020
Örnek Metin	Frost formation on evaporators negatively affects the cooling performance of refrigerators. It increases the thermal resistance between the refrigerant and air leading to a reduction in the system cooling capacity. In this study, the effect of frost accumulation over a bare and finned surface on the convective thermal resistances has been experimentally investigated under impinging flow conditions. The surfaces are vertically positioned in a horizontal wind tunnel. The convective resistances have been measured with an in-house developed heat flux measurement system. Finally, the effectiveness of the finned surface was derived from the measurements for dry, condensing flow and as well as for frosting conditions. Under frosting conditions, the effectiveness of the finned surface is measured as 1.4 that is by a factor of 2X lower compared to the effectiveness of the same finned surface operating under dry conditions. It has been observed that the frost accumulation initially takes place at the tip of the fins and leads to a 45% drop in the heat transfer rate when the fin tips are completely covered with frost. Further frost accumulation on the fin base does not result in an additional drop in the heat transfer rate. In this regard, the study emphasizes the importance of the fin tip design for the heat sinks operating under frosting conditions.
DOI	10.1115/IPACK2020-2569

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An experimental investigation into frost accumulation over vertical finned and unfinned surfaces during impinging air flow

Yazar Öksüz, Enes Abdülhakim, Saygın, Alper, Başol, Altuğ Melik, Budaklı, M., Arık, Mehmet

Basım Tarihi 2020

Basım Yeri - ASME

Konu Author keywords, Electronics cooling, Forced convection, Frost, Heat flux, Thermal resistance

Tür Belge

Dil İngilizce

Dijital Evet

Yazma Hayır

Kütüphane Özyeğin Üniversitesi

Demirbaş Numarası 978-079188404-1

Kayıt Numarası 8550ff7e-b5ce-485d-a5d7-e7f95de22fcc

Lokasyon Mechanical Engineering

Tarih 2020

Örnek Metin Frost formation on evaporators negatively affects the cooling performance of refrigerators. It increases the thermal resistance between the refrigerant and air leading to a reduction in the system cooling capacity. In this study, the effect of frost accumulation over a bare and finned surface on the convective thermal resistances has been experimentally investigated under impinging flow conditions. The surfaces are vertically positioned in a horizontal wind tunnel. The convective resistances have been measured with an in-house developed heat flux measurement system. Finally, the effectiveness of the finned surface was derived from the measurements for dry, condensing flow and as well as for frosting conditions. Under frosting conditions, the effectiveness of the finned surface is measured as 1.4 that is by a factor of 2X lower compared to the effectiveness of the same finned surface operating under dry conditions. It has been observed that the frost accumulation initially takes place at the tip of the fins and leads to a 45% drop in the heat transfer rate when the fin tips are completely covered with frost. Further frost accumulation on the fin base does not result in an additional drop in the heat transfer rate. In this regard, the study emphasizes the importance of the fin tip design for the heat sinks operating under frosting conditions.

DOI 10.1115/IPACK2020-2569