Pool boiling heat transfer enhancement over cylindrical tubes with water at atmospheric pressure, Part I: Experimental results for circumferential rectangular open microchannels

Mehta, Jeet S.; Kandlikar, Satish G.

doi:10.1016/j.ijheatmasstransfer.2013.03.087

Cited by 43 publications

(6 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As the primary nucleation of the bubbles occurs on the bottom surface of the tube, the horizontal tube activates more nucleation sites at its bottom and thus performed better in the case of pool boiling. Similar results have been reported in previous studies of pool boiling over cylindrical tubes [5,7].…”

Section: Effect Of Heating Tube Orientationsupporting

confidence: 92%

“…Kang [3] changed the angle of inclination of the heating element in progressions of 15° from the horizontal direction to the vertical direction, which has shown to improve the heating at 15° from the horizontal, due to a reduction in the formation of slower, heavier bubbles at the bottom surface. In another study [5], it was observed that the addition of circumferential rectangular microgrooves on cylindrical tubes significantly augments the heat transfer performance, and horizontal orientation of the test sections resulted in 10-15% augmented heat transfer compared to that in the vertical orientation. During the experiments, the active bubbles and the rewetting process were also found to play a key role in the overall heat transfer.…”

Section: Introductionmentioning

confidence: 96%

“…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%

See 2 more Smart Citations

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

Haidary¹,

Hasan²,

Adib³

et al. 2021

IJHT

View full text Add to dashboard Cite

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.

show abstract

Section: Effect Of Heating Tube Orientationsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Haidary¹,

Hasan²,

Adib³

et al. 2021

IJHT

View full text Add to dashboard Cite

show abstract

“…The pool boiling heat transfer enhancement by adding environment-friendly surfactants to pure water was experimentally described [67]. A study on heat transfer during pool boiling of water at atmospheric pressure over enhanced cylindrical micro-channel test surfaces was carried out [68]. A 2-D numerical simulation on nucleate boiling with help of VOSET method was presented [69].…”

Section: Pure Liquidsmentioning

confidence: 99%

Research progresses and future directions on pool boiling heat transfer

Kumar¹,

Bhutani²,

Khatak³

2015

J. Mech. Eng. Sci.

View full text Add to dashboard Cite

This paper reviews the previous work carried on pool boiling heat transfer during heating of various liquids and commodities categorized as refrigerants and dielectric fluids, pure liquids, nanofluids, hydrocarbons and additive mixtures, as well as natural and synthetic colloidal solutions. Nucleate pool boiling is an efficient and effective method of boiling because high heat fluxes are possible with moderate temperature differences. It is characterized by the growth of bubbles on a heated surface. It occurs during boiling of liquids for excess temperature ranging from 5 to 30 °C in various processes related to high vaporization of liquid for specific purposes like sugarcane juice heating for jaggery making, milk heating for khoa making, steam generation, cooling of electronic equipments, refrigeration and etcetera. In this review paper, pool boiling method during heating of liquids for specific purpose is depicted. It is inferred that enhancement in pool boiling heat transfer is a challenging and complex task. Also, recent research and use of various correlations for natural convection pool boiling is reviewed.

show abstract

“…Recent developments in measurement and visualization techniques enable research at mini and micro scales as well as investigating complex flow structures. Recent scientific interest has focused particularly on two-phase flows in mini-and micro-channels [7][8][9][10][11] as well as on the boiling of nano-fluids to enhance heat transfer capability [12][13][14][15][16]. Experimental investigations have also been carried out on two-phase flows in the components of conventional heat exchange devices such as tubes, channels and walls.…”

Section: Introductionmentioning

confidence: 99%

A novel 1D/2D model for simulating conjugate heat transfer applied to flow boiling in tubes with external fins

2014

View full text Add to dashboard Cite

This study presents a novel, simplified model for the time-efficient simulation of transient conjugate heat transfer in round tubes. The flow domain and the tube wall are modeled in 1D and 2D, respectively and empirical correlations are used to model the flow domain in 1D. The model is particularly useful when dealing with complex physics, such as flow boiling, which is the main focus of this study. The tube wall is assumed to have external fins. The flow is vertical upwards. Note that straightforward computational fluid dynamics (CFD) analysis of conjugate heat transfer in a system of tubes, leads to 3D modeling of fluid and solid domains. Because correlation is used and dimensionality reduced, the model is numerically more stable and computationally more time-efficient compared to the CFD approach. The benefit of the proposed approach is that it can be applied to large systems of tubes as encountered in many practical applications. The modeled equations are discretized in space using the finite volume method, with central differencing for the heat conduction equation in the solid domain, and upwind differencing of the convective term of the enthalpy transport equation in the flow domain. An explicit time discretization with forward differencing was applied to the enthalpy transport equation in the fluid domain. The conduction equation in the solid domain was time discretized using the CrankNicholson scheme. The model is applied in different boundary conditions and the predicted boiling patterns and temperature fields are discussed.

show abstract

Pool boiling heat transfer enhancement over cylindrical tubes with water at atmospheric pressure, Part I: Experimental results for circumferential rectangular open microchannels

Cited by 43 publications

References 31 publications

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

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

Research progresses and future directions on pool boiling heat transfer

A novel 1D/2D model for simulating conjugate heat transfer applied to flow boiling in tubes with external fins

Contact Info

Product

Resources

About