Heat transfer correlation models for electrospray evaporative cooling chambers of different geometry types

Wang, Hsiu Che; Mamishev, A.V.

doi:10.1016/j.applthermaleng.2012.01.061

Cited by 26 publications

(5 citation statements)

References 23 publications

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“…However it does increase the transient average heat transfer performance. Wang and Mamishev [11] later developed a set of correlations for the average heat transfer enhancement ratio and Nusselt number for an electrospray operated in the multi-jet regime. Their model for the heat transfer enhancement over natural convection showed 83% agreement with their experimental data, within a ±10% deviation.…”

Section: Spray Plumementioning

confidence: 99%

Heat transfer characteristics of single cone-jet electrosprays

Gibbons

Robinson

2017

International Journal of Heat and Mass Transfer

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Spray cooling is an attractive proposition for thermal dissipation due to its high efficiency and markedly lower power requirements than more conventional air cooling systems. The local convective heat flux to single source cone-jet electrospray using thin foil thermography has been investigated parametrically. Two-phase electrospray cooling using ethanol is explored for multiple nozzle sizes (D i = 0.33-1.37 mm), flow rates (Q = 2-16 µL min −1) and separation heights (H = 2.5-17.5 mm). The results shows two distinct regimes of electrospray cooling; evaporative and pool electrospray cooling. Cooling performance was shown to be dependent on separation height and flow rate. Nozzle size was shown not to be a significant parameter except for small dependency for the smallest nozzle size tested. Importantly, the results demonstrate that very high peak heat transfer enhancement of up to 18.71 times over natural convection can be achieved with electrospray cooling for exceptionally low flow rates (4 µL min −1).

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Section: Spray Plumementioning

confidence: 99%

Heat transfer characteristics of single cone-jet electrosprays

Gibbons

Robinson

2017

International Journal of Heat and Mass Transfer

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“…On the other hand, to meet the heat dissipation requirements of next-generation power electronics and devices, further development of advanced spray cooling is urgently needed. There are multiple ways to improve the spray cooling performance, including selection and alteration of the working fluid [39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57], optimization of spray parameters [58][59][60][61][62] or systems [17,[63][64][65][66][67][68][69][70][71][72][73][74][75][76], and surface engineering. The first two methods are based on the fluid side, which is limited in affecting liquid-wall interactions.…”

Section: Introductionmentioning

confidence: 99%

Spray Cooling on Enhanced Surfaces: A Review of the Progress and Mechanisms

Wang

Jiang

2021

Journal of Electronic Packaging

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The rapid development of electronics, energy and propulsion systems has led us to the point where their performances are limited by cooling capacities. Heat fluxes of 10~100, even over 1,000 W/cm2 need to be dissipated with minimum coolant flow rate in next-generation power electronics. Spray cooling is a high heat flux, uniform and efficient cooling technique proven effective in various applications. However, its cooling capacity and efficiency need to be further improved to meet next-generation ultrahigh-power applications. Engineering of surface properties and structures can fundamentally affect the liquid-wall interactions, thus becoming the most promising way to enhance spray cooling. However, the unclear mechanisms of surface-enhanced spray cooling cause lack of guiding principles for surface design. Here, progress in spray cooling on surfaces with structures of different scales are reviewed and their performances evaluated and compared. Spray cooling can achieve critical heat flux (CHF) above 945 W/cm2 and heat transfer coefficient (HTC) up to 57 W/cm2K on structured surfaces for pressurized nozzle and CHF and HTC up to 1250 W/cm2 and 250 W/cm2K, respectively, on a smooth surface with the assistance of secondary gas flow. CHF enhancement of 110% was achieved on hybrid micro- and nanostructured surfaces. A clear map of enhancement mechanisms is proposed after analysis. Some future concerns are also proposed. This work helps the understanding and design of engineered surfaces in spray cooling and provides insights for interdisciplinary applications of heat transfer and advanced engineering materials.

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“…Deneysel Çalışma (Experimental Study) Deneyler 4,4 kV gerilim, 0,2 ml/dk debi, 20 G (di=0,61 mm) nozul çapı ve 20 mm nozul-ısı alıcı arası mesafede gerçekleştirilmiştir. Deneylerin gerçekleştirildiği şartlar, uniform damlacık çapı ve dağılımının elde edildiği konijet elektrosprey modu oluşacak şekilde belirlenmiştir [24,25]. Isı alıcıya 3,2-2,99-2,75-2,59-2,4-2,19-2,02-1,88 kW/m 2 olmak üzere sekiz farklı ısı akısı uygulanmıştır.…”

Section: Materyal Ve Metod (Materials Andunclassified

“…Isı alıcıya 3,2-2,99-2,75-2,59-2,4-2,19-2,02-1,88 kW/m 2 olmak üzere sekiz farklı ısı akısı uygulanmıştır. Isı akıları bir mikro işlemcinin çalışması gereken optimum sıcaklık değeri [24] olan 45 ℃ ve maksimum çıkabileceği sıcaklık değeri [26] olan 100 ℃ aralığında sıcaklık değerlerini karşılayacak şekilde belirlenmiştir. Deney düzeneğinin şematik görseli Şekil 3' deki gibidir.…”

Section: Materyal Ve Metod (Materials Andunclassified

Comparison of Electrospray And Mechanical Spray Atomization Cooling Performances on Heat Sinks

2023

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Endüstride birçok alanda kullanılmakta olan elektrosprey soğutma alanında son yıllarda keşfedilmeye başlanan bir konudur. Bu çalışmada literatürde hakkında oldukça kısıtlı çalışmalar bulunan elektrosprey soğutma ile mekanik sprey soğutmanın ısı alıcı üzerindeki soğutma performansı irdelenmiştir. Aynı şartlarda elektrosprey ile gerçekleşen ısı transferinin verileri deneyler yapılarak elde edilirken, mekanik sprey soğutma verileri Ansys Fluent CFD programı kullanılarak elde edilmiştir. Yapılan deneysel ve sayısal çalışmanın sonucunda daha küçük partikül çapı ve yüklü damlacıkların elde edildiği elektrosprey soğutmada mekanik sprey soğutmaya göre yaklaşık %15 daha iyi bir ısı transfer performansı gösterdiği belirlenmiştir. Elektrosprey metodunda, mekanik spreye göre 3,2 kW/m 2 ısı akısında %13, 2,59 kW/m 2 ısı akısında %14, 1,88 kW/m 2 ısı akısında ise %17 daha iyi soğutma elde edildiği görülmüştür.

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Heat transfer correlation models for electrospray evaporative cooling chambers of different geometry types

Cited by 26 publications

References 23 publications

Heat transfer characteristics of single cone-jet electrosprays

Heat transfer characteristics of single cone-jet electrosprays

Spray Cooling on Enhanced Surfaces: A Review of the Progress and Mechanisms

Comparison of Electrospray And Mechanical Spray Atomization Cooling Performances on Heat Sinks

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