Effects of design parameters on a multi jet impinging heat transfer

Culun, Perihan; Çelik, Nevin; Pihtili, Kazım

doi:10.1016/j.aej.2018.01.022

Cited by 18 publications

(12 citation statements)

References 14 publications

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“…Villegas et al [20] used a coupling of computational tools, applying CFD to represent the friction-stir welding phenomenon. Culun et al [21] developed a synergistic analysis in CFD of heat transfer of impinging multi jets, evaluating parameters such as the geometry of the jet holes, their arrangement, the density of the jets through spanwise and streamwise directions, and the type of confinement. Elsamni et al [22] used CFD to study the characteristics of laminar flow in a semi-circular duct and the effect of the Reynolds number on the hydrodynamic development length and the friction factor, and subsequently compared them with straight and curved ducts.…”

Section: Introductionmentioning

confidence: 99%

CFD Modeling of Microchannels Cooling for Electronic Microdevices

Fábregas

Santamaria

Buelvas

et al. 2022

IIUMEJ

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A simulation of the cooling of electronic devices was carried out by means of microchannels, using water as a coolant to dissipate the heat generated from a computer processor, and thus stabilize its optimum operating temperature. For the development of this study, computational fluid mechanics modeling was established in order to determine the temperature profiles, pressure profiles, and velocity behavior of the working fluid in the microchannel. In the results of the study, the operating temperatures of the computer processor were obtained, in the ranges of 303 K to 307 K, with fluid velocities in the microchannels of 5 m/s, a pressure drop of 633.7 kPa, and a factor of safety of the design of the microchannel of 15. From the results, the improvement of the heat transfer in a cooling system of electronic devices was evidenced when using a coolant as a working fluid compared to the cooling by forced air flow traditional. ABSTRAK: Simulasi penyejukan alatan elektronik telah dibina menggunakan saluran mikro, di samping air sebagai agen penyejuk bagi menghilangkan haba yang terhasil dari pemproses komputer, dan penstabil pada suhu operasi optimum. Kajian ini mengenai model komputasi mekanik bendalir bagi menentukan profil suhu, profil tekanan, dan halaju perubahan bendalir dalam saluran mikro. Dapatan kajian menunjukkan suhu operasi pemproses komputer adalah pada julat suhu 303 K sehingga 307 K, dengan halaju bendalir dalam saluran mikro adalah pada kelajuan 5 m/s, penurunan tekanan sebanyak 633.7 kPa, dan faktor keselamatan 15 bagi reka bentuk saluran mikro. Ini menunjukkan terdapat kenaikan pemindahan haba bagi sistem penyejukan alatan elektronik ini, terutama apabila cecair digunakan sebagai penyejuk haba berbanding kaedah tradisi iaitu dengan mengguna pakai aliran udara sebagai agen penyejuk.

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Section: Introductionmentioning

confidence: 99%

CFD Modeling of Microchannels Cooling for Electronic Microdevices

Fábregas

Santamaria

Buelvas

et al. 2022

IIUMEJ

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“…The heat and mass transfer characteristics of a PEMFC equipped with multiple impingement jet flow field (MIJFF) are affected by several geometric and flow parameters. Some examples are the intensity of the jet turbulence, the geometry of the jet outlet and size of the nozzles, jet array assembly, and the distance between the nozzle and the plate 20,22 . Modifying the geometry of the nozzle, casting artificial roughness, placing obstacles on the solid boundary, or directing the fluid to the target plane are some of the techniques of creating vortices to increase mixing, reduce the thickness of the thermal boundary layer, and thereby significantly increase the wall heat transfer coefficient 20 .…”

Section: Introductionmentioning

confidence: 99%

An innovative application of multiple impinging jet flow field in fuel cells

Khademi

Bazargan

2022

Heat Trans

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The flow field in a fuel cell is expected to distribute the reactants as uniformly as possible over the active plate, support the reasonable pressure drop across the channel and maximize the mass transfer through the catalyst layers. To simultaneously accomplish these requirements, an innovative multiple impingement jet flow field (MIJFF) is proposed in this study. A threedimensional thermo-fluid simulation is used to evaluate the proposed idea and compare its performance against the commonly used parallel field flow (PFF).The domain of calculations includes a channel with multiple impingement jets linked to a porous gas diffusion layer under low Reynolds flow conditions. The results reveal that the suggested MIJFF design significantly increases the transport of the reactant gases through the catalyst layer. The penetration depth into the catalyst layer in the MIJFF arrangement is higher than that of the PFF setup and the use of the catalyst layer is optimized, which in turn can lead to a reduction of the activation drop. Compared to a PFF design under similar operating conditions, the mean Nusselt number is shown to increase by a factor of about 3.5 in the MIJFF setup. Furthermore, the temperature is more uniformly distributed in the MIJFF pattern which results in more effective distribution of the reactant gases over the active surface. The current study shows that under equal pressure drop

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“…In a recent investigative work, Dutta and Singh [4] discussed the effects of geometrical features on impingement and indicated opportunities in the research and exploration on impingement heat transfer. There are many configurational variables that have been explored in detail in the past, e.g., single jet [5] or array of jets [6], as shown in Figure 1 [7,8]. Fundamental studies include a free jet directed to target surface (Figure 1), a confined jet [9], a slot jet [10], a single jet subjected to initial crossflow [11], a crossflow scheme [6] (Figure 1), an angled jet [12], jet-to-jet spacing (x/d) [13], jet-to-target spacing (z/d) [13], relative arrangement of jets (inline or staggered) [13], impingement channel modification [14], crossflow regulation through variable diameter jets [15], nozzle shape [16], nozzle aspect ratio [17], target surface modification [18], and many more.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 1. Different channel flow configurations used in jet-array impingement heat transfer [7,8] (courtesy: open access and ASME) [4].…”

Section: Introductionmentioning

confidence: 99%

Opportunities in Jet-Impingement Cooling for Gas-Turbine Engines

Dutta

Singh

2021

Energies

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Impingement heat transfer is considered one of the most effective cooling technologies that yield high localized convective heat transfer coefficients. This paper studies different configurable parameters involved in jet impingement cooling such as, exit orifice shape, crossflow regulation, target surface modification, spent air reuse, impingement channel modification, jet pulsation, and other techniques to understand which of them are critical and how these heat-transfer-enhancement concepts work. The aim of this paper is to excite the thermal sciences community of this efficient cooling technique and instill some thoughts for future innovations. New orifice shapes are becoming feasible due to innovative 3D printing technologies. However, the orifice shape variations show that it is hard to beat a sharp-edged round orifice in heat transfer coefficient, but it comes with a higher pressure drop across the orifice. Any attempt to streamline the hole shape indicated a drop in the Nusselt number, thus giving the designer some control over thermal budgeting of a component. Reduction in crossflow has been attempted with channel modifications. The use of high-porosity conductive foam in the impingement space has shown marked improvement in heat transfer performance. A list of possible research topics based on this discussion is provided in the conclusion.

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Effects of design parameters on a multi jet impinging heat transfer

Cited by 18 publications

References 14 publications

CFD Modeling of Microchannels Cooling for Electronic Microdevices

CFD Modeling of Microchannels Cooling for Electronic Microdevices

An innovative application of multiple impinging jet flow field in fuel cells

Opportunities in Jet-Impingement Cooling for Gas-Turbine Engines

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