Bubble impingement and the mechanisms of heat transfer

Donoghue, D.B.; Albadawi, A.; Delauré, Yan; Robinson, A.J.; Murray, Darina B.

doi:10.1016/j.ijheatmasstransfer.2013.12.014

Cited by 31 publications

(11 citation statements)

References 34 publications

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“…The paint thickness was determined using a Dektak 6m programmable surface profiler. The foil properties were defined using the supplier data sheet, while the paint layer was determined from data tabulated by Donoghue [12] and Raghu and Philip [13]. The surface roughness of the steel foil was determined using a MicroXAM White light Interferometric Surface Profiler.…”

Section: Materials Propertiesmentioning

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: Materials Propertiesmentioning

confidence: 99%

Heat transfer characteristics of single cone-jet electrosprays

Gibbons

Robinson

2017

International Journal of Heat and Mass Transfer

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“…This thermal enhancement is due to the large-scale mixing of cold water and ABI as the distance between the mixing chamber and the C-PHE entrance port is greater than 0.7 m [28]. In addition, as the air bubbles approach the C-PHE wall the heat transfer boosts as the plate corrugations act as bluff bodies [31].…”

Section: Ntu and Ntu Ratio Analysismentioning

confidence: 99%

Combined Energetic and Exergetic Performance Analysis of Air Bubbles Injection into a Plate Heat Exchanger: An Experimental Study

Marouf

Fouad

2023

Energies

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This paper aims to give a comprehensive energetic-exergetic performance analysis on the impacts of injecting-submillimeter of air bubbles into both sides of cold and hot water streams before the entrance port of a corrugated plate heat exchanger (C-PHE) having ten plates within counterflow configuration. Hence, optimize the energy and exergy effectiveness at different operating conditions for counter and parallel fluid flow configurations. Hot streams were studied in seven flow rates ranging from 280 L/h to 880 L/h with a regular step of 100 L/h, and constant hot water temperature and cold-water stream of 50 °C and 290 L/h, respectively. Hence, the air was discharged with four flow rates ranging between 150 and 840 L/h. The obtained results showed the vital role of the ABI technique in enhancing the NTU and effectiveness by 59% and 18.6%, respectively, for CWS. The entropy generation was reduced to 0.038 W/K and the augmentation entropy generation number to 0.087 at the low airflow rate for CWS, which are the main parameters for evaluating the EGM. These two parameters increase the Witte-Shamsundar-efficiency to a maximum value of 98.6% at the same operating conditions. Moreover, the exergy effectiveness was enhanced to a maximum value of 80.9% at a high ABI flow rate and low volumetric rate of the hot stream at CWS. The thermo-economic assessment has been carried out, which revelers the positive effects of ABI on the combined energetic and exergetic performance on both sides, i.e., hot and cold sides.

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“…The traditional boundary detection of droplets and bubbles is achieved using a thresholding technique in a side-view orientation (see Figure 1a) with backlighting [27,38]. Every pixel of a captured image has an associated magnitude.…”

Section: Boundary Detectionmentioning

confidence: 99%

Analysis of a Wide Range of Commercial Exterior Wood Coatings

et al. 2020

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This study was focused on measuring the properties of twenty-three commercially available coatings formulated for exterior wood applications. The coatings were characterized by measuring their surface tension, solid content, viscosity, pH, and glass transition temperatures (Tg). Additionally, the wetting properties of coating droplets on wood substrates were measured. The contact angle of solvent-based and water-based coatings were characterized on untreated southern yellow pine wood samples using high-resolution image analysis and the Young–Laplace solution. An innovative image processing technique for determining the average diameter of coating droplets on wood was developed, and an iterative method to calculate the average contact angle using the Young–Laplace solution was applied. The water-resistance of the coated wood samples was evaluated during one week of water immersion tests. In general, solvent-based coatings had significantly lower contact angles and water uptake than water-based coatings. Water-based paint samples had the largest average contact angle (81°), and solvent-based transparent penetrating stains had the smallest contact angle (13.9°). A strong correlation was observed between the coating water uptake and their surface tension and solid content.

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Bubble impingement and the mechanisms of heat transfer

Cited by 31 publications

References 34 publications

Heat transfer characteristics of single cone-jet electrosprays

Heat transfer characteristics of single cone-jet electrosprays

Combined Energetic and Exergetic Performance Analysis of Air Bubbles Injection into a Plate Heat Exchanger: An Experimental Study

Analysis of a Wide Range of Commercial Exterior Wood Coatings

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