Free Convection Nusselt Number for Vertical U-Shaped Channels

Pol, D.; Tierney, J. K.

doi:10.1115/1.3450106

Cited by 41 publications

(16 citation statements)

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“…Figure 7a suggests that the optimal spacing between plates falls around 2.875 mm in the present plate-fin array of nonuniform temperature as the heating power is 7 W. Based on the heater temperature that the simulation results yielded at 7 W for the primary handheld projector having plate-fin array, the optimal fin spacing for the plate-fin array would be 3.3 mm and 4.3 mm, estimated by the correlation proposed in [11,14], respectively. The larger optimal spacing that the correlation predicted was because the ambient temperature was defined as the air temperature outside the projector, 303 K, which caused an overestimated Ra number used in both correlations [11,14] since the actual air temperature surrounding the fin array would be considerably higher than 303 K. Similar variation trend of the thermal resistance to the abovementioned case also occurred as the handheld projector was equipped with a pin-fin array as shown in Figure 7a. The thermal resistance slightly reduced as the row of pin fin increased from 7 to 9, which yielded a lowest thermal resistance with the spacing between pins of 3.375 mm, and then gradually increased as the pin row further increased.…”

Section: Figurementioning

confidence: 99%

“…In addition, the heat transfer coefficient of a surface with identical surface temperature and dimensions to the aforementioned surface in the plate-fin array in the study was also estimated using several selected correlations. Those selected correlations are applicable for the estimation of the heat transfer coefficient of either a vertical, single plate [3,4,6] or a plate-fin array [9,11,18] in an infinite, still medium. Figure 6 demonstrates the comparison of the heat transfer coefficient among those data.…”

Section: Figurementioning

confidence: 99%

“…Numerous heat transfer correlations on the natural convection of an isolated surface with various inclinations in form of Nu = CRa n have been proposed [3][4][5][6][7][8]. To some degree, those heat transfer studies on an isolated surface formed the foundation of numerous following studies which investigated various effects on the natural convection heat transfer of a fin array in an infinite, still medium [9][10][11][12][13][14][15][16][17][18]. The results of those studies revealed that the fin material, fin pattern, and the spacing between fins, as well as the fin thickness affect the thermal performance of the fin array.…”

Section: Introductionmentioning

confidence: 99%

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A Numerical Study on Natural Convection Heat Transfer of Handheld Projectors with a Fin Array

2017

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This study numerically investigates the effects of the number of bottom openings and the fin spacing on both the natural convection heat transfer and airflow field of the handheld projector with various orientations. The horizontally-oriented 120 mm × 53 mm × 19 mm handheld projector, which had 11 bottom openings and was installed with either 7 plate fins or 13 rows of square pin, was considered as the primary case. The fin number varied from 6 plates to 13 plates or from 7 pin rows to 16 pin rows, while the bottom openings varied from 11 to 15 in this study with handheld projector held at a specified inclination ranging from −90 • to 90 • . The results showed that the heat transfer coefficient of a specific surface of the plate-fin array installed in the primary handheld projector increased from 6 to 7 W/m 2 ·K as the heating power increased from 2 W to 7 W. The optimal fin spacing in the handheld projector possessing 11 bottom openings was 2.875 mm and 3.375 mm for the plate-fin and pin-fin, respectively, at a heating power of 7 W. Although the velocity magnitude of the airflow between fins increased as the bottom opening increased, it was not able to offset the reduction of the airflow velocity resulting from the fin spacing reduction.

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Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Numerical Study on Natural Convection Heat Transfer of Handheld Projectors with a Fin Array

2017

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“…If 41 < Ta < 100 (Our model: 79.5), the flow takes on a vertex form and Eq. (12) has to be used to calculate Nu [8]. …”

Section: Analysis Of Forced Convection (Air Gap)mentioning

confidence: 99%

Thermal Analysis of High Speed Induction Motor by Using Lumped-Circuit Parameters

Han¹,

Choi²,

Kim³

et al. 2015

Journal of Electrical Engineering and Technology

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“…Elenbaas [2] was the first to create a detailed study on heat sink fins. Instead, Starner and McManus [3], Welling and Wooldridge [4] carried out several experimental studies, while Van de Pol and Tierney [5] developed a correlation with Welling and Woolridge's experimental results. Finally, Bilitsky [6] has carried out a complete parametrical analysis of heat sinks in relation to the height and thickness of the fins.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental analysis of the performances of a heat sink with vertical orientation in natural convection

Cucumo

Ferraro

Kaliakatsos

et al. 2014

Int J Energy Environ Eng

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In the various areas in which electrical components are used, the problem of heat dissipation generated due to the absorption of electrical energy assumes great interest and is worthy of an in-depth study. In steady state conditions, the thermal power generated can equal the electrical power absorbed and leads to an alteration in the physical properties of electrical components compromising their performance and correct functioning. One of the most frequently adopted solutions consists in the application of a heat sink on the surface to be cooled. Experimental tests were conducted using an infrared thermal camera, an internal climate control unit for the recording of the thermo hygrometric conditions of the environment and a finite element software (ProENGINEER) to simulate the thermal behaviour of the heat sink in order to analyse the modalities of thermal exchange of the heat sink. The results obtained were subsequently compared with the heat sink properties provided by the manufacturer. The main objective of the work is that of providing a methodology that blends the use of thermographic and simulation techniques with finite elements, in order to render the development of a theoretical-experimental correlation possible for any physical condition and geometrical configuration taken into consideration. This methodology is confirmed in the field of technological development of electrical components, where at each stage of the planning process exists a marked intertwining of computing, electronics, mechanics and heat transmission.

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Free Convection Nusselt Number for Vertical U-Shaped Channels

Cited by 41 publications

References 0 publications

A Numerical Study on Natural Convection Heat Transfer of Handheld Projectors with a Fin Array

A Numerical Study on Natural Convection Heat Transfer of Handheld Projectors with a Fin Array

Thermal Analysis of High Speed Induction Motor by Using Lumped-Circuit Parameters

Theoretical and experimental analysis of the performances of a heat sink with vertical orientation in natural convection

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