Improvement of heat transfer by means of ultrasound: Application to a double-tube heat exchanger

Legay, M.; Simony, B.; Boldo, P.; Gondrexon, Nicolas; Person, Stéphane Le; Bontemps, André

doi:10.1016/j.ultsonch.2012.04.001

Cited by 84 publications

(28 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From the heating medium, delivered by the inlet (5), the jets are formed in the perforated partition (1). They are radially directed toward the inner surface of the cylindrical heat transfer wall (2), imping on it and then as the cooled streams are flowing towards the outlet (6). The heated medium is delivered through the inlet (7) and it is flowing in the space between the shell (4) and perforated partition (3).…”

Section: Minijets Heat Exchanger (Mjhe)mentioning

confidence: 99%

“…Another example of an active technique is the usage of ultrasound to vibrate the heat transfer surface or the fluid that flushes it. Gondrexon et al [5] and Legay et al [6] conducted studies to assess the effect of ultrasound on the heat exchanger efficiency, demonstrating that for the laminar flow the ultrasounds are particularly beneficial-the heat transfer coefficient can be more than doubled.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

2019

View full text Add to dashboard Cite

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.

show abstract

Section: Minijets Heat Exchanger (Mjhe)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2019

View full text Add to dashboard Cite

show abstract

“…Klima et al [32] studied the effect of sonoreactor geometry on the distribution of ultrasonic intensity, the calculation together with experiment revealed that the whole reactor behaved like a resonator and the energy distribution depends strongly on its shape. Legay et al [33] designed a new kind of ultrasonically-assisted heat exchanger, it was demonstrated that ultrasound can be used efficiently as a heat transfer enhancement technique, even in such complex systems as heat exchangers.…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

The effect of ultrasonic processing on solidification microstructure and heat transfer in stainless steel melt

Zhang

Kang

Wang

et al. 2015

Ultrasonics Sonochemistry

View full text Add to dashboard Cite

The heat transfer in the ultrasonic processing of stainless steel melt is studied in this thesis. The temperature field is simulated when the metal melt is treated with and without ultrasound. In order to avoid the erosion of high temperature melt, ultrasound was introduced from the bottom of melt. It is found that the temperature of melt apparently increases when processed with ultrasound, and the greater the ultrasonic power is, the higher the melt temperature will be; ultrasonic processing can reduce the temperature gradient, leading to more uniform temperature distribution in the melt. The solidification speed is obviously brought down due to the introduction of ultrasound during solidification, with the increasing of ultrasonic power, the melt temperature rises and the solidification speed decreases; as without ultrasound, the interface of solid and mushy zone is arc-shaped, so is the interface of liquid and mushy zone, with ultrasound, the interface of solid and mushy zone is still arc-shaped, but the interface of liquid and mushy zone is almost flat. The simulation results of temperature field are verified in experiment, which also indicates that the dendrite growth direction is in accord with thermal flux direction. The effect of ultrasonic treatment, which improves with the increase of treating power, is in a limited area due to the attenuation of ultrasound.

show abstract

“…Gondrexon et al [7]'s investigation showed that by ultrasound of 120 W/24 kHz overall heat transfer coefficient can increase up to 1.2 times of original value without treatment. Legay et al [8] gave experimental results that the heat transfer enhancement factor increased about 1.2-2.3 for double-tube heat exchanger by 35 kHz ultrasound. Guo [9] concluded experimentally that the ultrasonic frequency may have better effect than flow velocity and ultrasonic power for cooling water, and got the best descaling effects in case of ultrasound 30 kHz and 400 W, and 0.6 m/s flow velocity.…”

Section: Introductionmentioning

confidence: 99%