Publisher Summary Impinging liquid jets have been demonstrated to be an effective means of providing high heat or mass transfer rates in industrial transport processes. This chapter summarizes the available analytical and experimental work in the area with the objective of correlating the research findings. Significant progress has been made in understanding the fundamentals of heat, mass, and momentum transport in these systems. This chapter suggests that, there is considerable need for further research in liquid jet array applications, both in submerged and free-surface jet configurations. Cross-flow effects in these systems, which have been quite well characterized for submerged jets, have received only superficial treatment for free-surface jets. The physical phenomena are highly complex, requiring careful experimental investigation.

Single-Phase Liquid Jet Impingement Heat Transfer

https://bura.brunel.ac.uk/bitstream/2438/14115/5/Fulltext.pdf

Flow boiling in microchannels: Fundamentals and applications

A general criterion for evaporative heat transfer in micro/mini-channels

Nanobubbles are a mystery as to their stability and longevity. So far their uses are limited to high value applications, such as medical imaging and controlled drug delivery and release. The current methods of nanobubble generation and understanding of nanobubble interfacial structure are reviewed. The analysis of the potential benefits of nanobubbles leads to the conclusion that if energy efficient nanobubbles that were flexible in injection and production were available, there would be widespread usage. The hypothesis that a recent methodology for energy efficient microbubble generation could be extended to nanobubble generation is presented and reviewed. The current applications and promising potential applications for energy efficient microbubbles are discussed, ranging from bioreactors to dispersal of ozone, through flotation separations and enhanced chemical reactions by reactive separation.

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Towards energy efficient nanobubble generation with fluidic oscillation

This paper reviews advanced heat transfer devices utilizing advanced manufacturing technologies, including well-established thermal management applications. Several factors have recently contributed to developing novel heat transfer devices. One of the potential technologies revolutionizing the field of energy conversion is additive manufacturing (AM), colloquially known as three-dimensional (3D) printing. This technology permits engineers to develop a product with a high level of freeform features both internally and externally within a complex 3D geometry. Among different AM approaches, selective laser melting (SLM) is a well-used technique for developing products with a lower cost-to-complexity ratio and quicker time production compared to other manufacturing processes. The integration of SLM technology into heat exchangers (HXs) and heat sinks (HSs) has a strong potential, especially to fabricate customized and complex freeform shapes. The aim of this research is to review the advancement in design complexities of different industrial heat transfer devices incorporating metal SLM fabrication. The review is not meant to put a ceiling on the AM process, but to enable engineers to have an overview of the capabilities of SLM technology in the field of thermal management applications. This review presents the opportunities and challenges related to the application of SLM technology in connection to novel HXs and HSs, as well as heat pipes (HPs). The latter are passive heat transfer devices utilized in many thermal control applications, especially related to electronics cooling and energy applications.

The utilization of selective laser melting technology on heat transfer devices for thermal energy conversion applications: A review

The use of the two-phase closed thermosyphons (TPCTs) is increasing for many heat transfer applications. This paper reviews the most recent published experimental and theoretical studies on the TPCT. After a description of the TPCT operating principle and the performance characteristics, the heat transfer analysis in condenser and evaporator sections that depends on the complex two-phase process are described. The influence of the affecting parameters on the performance of TPCTs such as the geometry (diameter, shape and length), the inclination angle, the filling ratio (FR), the working fluid, the operating temperature and pressure analyzed by various researchers is discussed. The various operating limits occurring in a thermosyphon includes viscous, sonic, dryout, boiling and flooding are also analyzed. Considering the application of TPCTs, the paper presents a review of experimental tests and applications. This paper can be used as the starting point for the researcher interested in the TPCTs and their renewable energy applications.

Two-phase closed thermosyphons: A review of studies and solar applications

Unsteady experimental and numerical analysis of a two-phase closed thermosyphon at different filling ratios

Measurements of rising velocity of a small bubble in a stagnant fluid in one- and two-component systems

Saturated Pool Boiling Enhancement by Means of an Electric Field

Therst section of this paper (overview on boiling heat transfer characteristics) is directed to those who are not specialists in theeld of boiling heat transfer, in order to make them aware of the fundamental physical mechanisms, the advantages and the main problems of this technique. Next, some of the basic knowledge achieved on terrestrial boiling heat transfer is outlined, along with the benets and the problems raised from its application in space. Finally, the past and forthcoming research activities of the European teams in thiseld are reported, in addition to the main results achieved and a short overview on the available test facilities.

/pdf/review-of-reduced-gravity-boiling-heat-transfer-european-4q49mzh4w3.pdf

Paolo Di Marco

Papers

Two-phase closed thermosyphons: A review of studies and solar applications

Unsteady experimental and numerical analysis of a two-phase closed thermosyphon at different filling ratios

Measurements of rising velocity of a small bubble in a stagnant fluid in one- and two-component systems

Saturated Pool Boiling Enhancement by Means of an Electric Field

Review of Reduced Gravity Boiling Heat Transfer: European Research