Heat transfer performance of a confined single slot jet of air impinging on a flat surface

Żukowski, Mirosław

doi:10.1016/j.ijheatmasstransfer.2012.10.069

Cited by 50 publications

(14 citation statements)

References 22 publications

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“…The obtained regression rate shown in Figure 4 shows a similar trend to the heat transfer characteristic of a nonreactive impinging slot jet [20]. When no combustion takes place, it is known that the Nusselt number is proportional to Re 0.5 in the stagnation region, while Re 0.8 in the wall-jet region [21].…”

Section: Measurement Of Regression Ratesupporting

confidence: 62%

Modified Regression Rate Formula of PMMA Combustion by a Single Plane Impinging Jet

Matsuoka

Kyohei

Nakamura

et al. 2017

International Journal of Aerospace Engineering

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A modified regression rate formula for the uppermost stage of CAMUI-type hybrid rocket motor is proposed in this study. Assuming a quasi-steady, one-dimensional, an energy balance against a control volume near the fuel surface is considered. Accordingly, the regression rate formula which can calculate the local regression rate by the quenching distance between the flame and the regression surface is derived. An experimental setup which simulates the combustion phenomenon involved in the uppermost stage of a CAMUI-type hybrid rocket motor was constructed and the burning tests with various flow velocities and impinging distances were performed. A PMMA slab of 20 mm height, 60 mm width, and 20 mm thickness was chosen as a sample specimen and pure oxygen and O2/N2mixture (50/50 vol.%) were employed as the oxidizers. The time-averaged regression rate along the fuel surface was measured by a laser displacement sensor. The quenching distance during the combustion event was also identified from the observation. The comparison between the purely experimental and calculated values showed good agreement, although a large systematic error was expected due to the difficulty in accurately identifying the quenching distance.

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Section: Measurement Of Regression Ratesupporting

confidence: 62%

Modified Regression Rate Formula of PMMA Combustion by a Single Plane Impinging Jet

Matsuoka

Kyohei

Nakamura

et al. 2017

International Journal of Aerospace Engineering

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“…This technique can be found in various engineering areas, but within the context of the scope of the paper, the application in the solar collectors as a kind of heat exchangers should be mentioned [21]. The microjet solar heater was proposed by Zukowski in [22,23] with the application of the slot jets impinging on the flat plate. It was shown that the impinging jets caused the increase in the Nusselt number.…”

Section: Introductionmentioning

confidence: 99%

Thermal-Hydraulic Studies on the Shell-and-Tube Heat Exchanger with Minijets

2019

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In this paper a patented design of a heat exchanger with minijets, with a cylindrical construction is presented. It is followed by the results of its systematic experimental investigations in the single-phase convection heat transfer mode. Based on these results, validation of selected correlations (coming from the literature) describing the Nusselt number was carried out. An assessment of the heat exchange intensification level in the described heat exchanger was done through the comparison with a shell-and-tube exchanger of a classical design. The thermal-hydraulic characteristics of both units were the subjects of comparison. They were constructed for the identical thermal conditions, i.e., volumetric flow rates of the working media and the media temperatures at the inlets to the heat exchanger. The experimental studies of both heat exchangers were conducted on the same test facility. An increase in the heat transfer coefficients values for the minijets heat exchanger was observed in comparison with the reference one, whereas the generated minijets caused greater hydraulic resistance. Experimentally confirmed intensification of heat transfer on the air side, makes the proposed minijets heat exchanger application more attractive, for the waste heat utilization systems from gas sources.

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“…The thermal performance of a confined impinging slot jet was studied using Nusselt number by varying ISSN 0104-6632 Printed in Brazil www.abeq.org.br/bjche the Reynolds number and nozzle-to-plate spacing (Zukowski, 2013). The effect of nozzle-to-surface spacing, nozzle diameter and Reynolds number (6000 to 23000) on heat transfer was studied for electronic components (Anwarullah et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Effect of Steel Plate Thicknesses and Fluid Flow Characteristics of an Impinging Air Jet on Heat Transfer at the Stagnation Point

Jeyajothi

Kalaichelvi

2019

Braz. J. Chem. Eng.

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The design and process of heat transfer elements, from its source to heat sink through various media vary according to the product and system concerned. The effect of thickness of a steel plate on heat transfer characteristics with an impinging air jet at the stagnation point was studied. Experiments were carried out with different nozzles, heights, and velocities. It was concluded that the heat transfer increases with the increase in velocity and the increase in Reynolds Number, but decreases with the increase in nozzle height from the impinging point. A maximum stagnation Nusselt number of 309.06 was obtained at the optimum conditions with a plate thickness of 3 mm. The new empirical correlations calculated from the experiments were in reasonable agreement with the equations in the literature and the deviation was less than 15%.

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Heat transfer performance of a confined single slot jet of air impinging on a flat surface

Cited by 50 publications

References 22 publications

Modified Regression Rate Formula of PMMA Combustion by a Single Plane Impinging Jet

Modified Regression Rate Formula of PMMA Combustion by a Single Plane Impinging Jet

Thermal-Hydraulic Studies on the Shell-and-Tube Heat Exchanger with Minijets

Effect of Steel Plate Thicknesses and Fluid Flow Characteristics of an Impinging Air Jet on Heat Transfer at the Stagnation Point

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