Effect of Confinement and Heater Surface Inclination on Pool Boiling Performance of Patterned Wettability Surfaces

Sarode, Ajinkya; Raj, Rishi; Bhargav, Atul

doi:10.1615/jenhheattransf.2020033852

Cited by 6 publications

(3 citation statements)

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“…The orientation of the heater in the pool boiling chamber can influence the pool boiling heat transfer performance. For a given wall superheat, several researchers found enhanced heat transfer rate, characterized by increased critical heat flux (CHF) and heat transfer coefficient (HTC), when the heater orientation was changed from horizontal to vertical [1][2][3][4][5][6][7]. Marcus and Dropkin [1] suggested that this change in heater orientation causes an increased path length for the departing bubbles along the heater surface, and thus increases the superheated boundary region.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of Pool Boiling Heat Transfer over Plain and Rough Cylindrical Tubes

Haidary¹,

Hasan²,

Adib³

et al. 2021

IJHT

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This study investigates the pool boiling heat transfer of water over cylindrical heating tubes for different orientations and surface roughness of the tubes. First, two orientations of a smooth heating tube, horizontal and vertical, were used in the boiling chamber. For a given heat flux, the heat transfer coefficient achieved with the horizontal tube was always higher than that for the vertical tube. To investigate the influence of surface roughness, a rough heating tube with a fully rough outer surface was developed through a metal etching process. Under the same range of wall superheat, the rough tube enhanced the heat transfer rate significantly compared to the smooth tube. Finally, a modified heating tube (MHT) was developed by axially roughening half of the surface of an originally smooth tube. The orientation angle of the rough surface of this MHT was varied from 0° (horizontal-upward) to 180° (horizontal-downward) in the chamber. The heat flux increased significantly with the increase of orientation angles from 0° to 90° (the maximum of 80 kW/m2 at 90°), whereas the same decreased as the orientation angle is further increased from 90° to 180°. Results revealed that the bubble dynamics over the heating tubes play a vital role in pool boiling performance.

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Section: Introductionmentioning

confidence: 99%

“…During the experiments, the active bubbles and the rewetting process were also found to play a key role in the overall heat transfer. However, recently, Sarode et al [6] showed an invariance in the boiling heat transfer performance for horizontal and vertical heater orientations.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Pool Boiling Heat Transfer over Plain and Rough Cylindrical Tubes

Haidary¹,

Hasan²,

Adib³

et al. 2021

IJHT

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“…Sarode et al (2020) experimentally investigated and compared the individual effects of confinement and orientation (horizontal and vertical) on the HTC obtained during boiling on macroscale-patterned wettability surfaces with the baseline case of a homogeneous wettability bare surface. The baseline hydrophilic substrate was modified using macroscale hydrophobic dots with a sufficiently large pitch to avoid lateral bubble coalescence on the modified patterned wettability surfaces.…”

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confidence: 99%

Heat Transfer Enhancement-a Brief Review of Literature in 2020 and Prospects

et al. 2021

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This review provides a brief literature survey on enhanced heat transfer research published in the English language journals in 2020. A topic search containing either "heat transfer" or "heat transport" or "thermal transport" in the Web of Science resulted in over 28,000 papers published in 2020 and nearly 30% were relevant to heat transfer intensification, which indicates the importance and rapid development of heat transfer enhancement technologies. The chosen studies focus on various heat transfer enhancement research categorized into conduction, convection, radiation, boiling and condensation, energy storage, thermal management, and cross research involving two or more categories. Heat conduction papers are selected from the micro/nanoscale areas with a focus on interfacial phenomena. Important active, passive, and compound techniques for enhancing convective heat transfer are incorporated. Thermal radiation is concentrated on near-2 field radiation and solar energy. Heat transfer enhancement in boiling and condensation as well as in thermal energy storage, renewable and sustainable energy, and thermal management of electronics and high-end equipment is critical in many engineering applications. From the selected literature published in 2020, significant attempts have been made to research and development on heat transfer enhancement technology covering both conventional and emerging techniques. The prospects of the heat transfer enhancement research are reflected according to the literature survey.Research of innovative heat transfer enhancement techniques is immense, encompassing every aspect from understanding the fundamental theory and physical mechanisms of various heat transfer enhancement techniques to their applications. Research of emerging techniques using new interfacial materials, nanofluids, micro-and nano-structures, microchannels, and new compound enhancement techniques incorporating conventional and new techniques becomes popular.However, there are big challenges in understanding the mechanisms, engineering design methodology and applications with these emerging techniques. Many aspects are urgently needed to be investigated and developed to achieve systematic theory, mechanisms and design methodology for applications in thermal processes, energy storage, renewable energy, decarbonized heating and cooling and many industrial and civil sectors.

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