Analytical solution and heat transfer of two-phase nanofluid flow between non-parallel walls considering Joule heating effect

The past decade has seen tremendous growth in areas of micro- and nano-fluidics, and MEMs flow control. Nowadays, there is considerable interest in micro- and nano/technologies consisting of small structures in contact with liquid media. By increasing the motivations of using miniaturized devices such as MEMS and NEMS and inventing new methods of their manufacturing, the inspirations of their study and analysis have been increased more and more. One of the most important characteristics of these devices which have undeniable impacts on their performances is miniaturized-channel flow field. By decreasing the dimensions of channels, the influence of surface effects becomes prominent and cannot be ignored. One of the most charismatic categories of these phenomena is elecrokinetic effect which can results in electroosmotic flow field (EOF) that has many advantages such as being vibration free, being much more compact, having flat-form velocity and etc. These beneficiaries lead to the increasing stimulus of using this type of flow field. One of the most important disadvantages of EOF is the Joule heating effect, the generation of heat due to the electroosmosis effect. Besides, miniaturized-channels are usually used as heat sink in miniaturized devices. By considering these facts, it can be concluded that heat characteristics of EOF must be studied carefully in order to manage the Joule heating effect and to utilize the cooling characteristics of miniaturized-channels. By reviewing the studies that have been performed in this field of study, it can be concluded that there is not any analytical approaches in dealing with heat transfer of EOF in miniaturized-channels though analytical formulas are completely essential for investigating, monitoring and controlling of any systems. In this regards, having some analytical studies on heat transfer analysis of miniaturized-channel flow field is completely essential. In the present study, by using the Schwartz-Christoffel mapping, an analytical tactic will be proposed in order to find electroosmotic velocity and consequently temperature distribution of EOF in micro- and transitional nano-channels.

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Peristaltic Carreau-Yasuda nanofluid flow and mixed heat transfer analysis in an asymmetric vertical and tapered wavy wall channel

Reports in Mechanical Engineering ◽

10.31181/rme200101128h ◽

2020 ◽

Vol 1 (1) ◽

pp. 128-140 ◽

Cited By ~ 1

Author(s):

Mohammad Hatami ◽

◽

D Jing ◽

Keyword(s):

Heat Transfer ◽

Least Square Method ◽

Weissenberg Number ◽

Least Square ◽

Heat Transfer Analysis ◽

Phase Method ◽

Nanofluid Flow ◽

Two Phase ◽

Nanoparticles Concentration ◽

The Right

In this study, two-phase asymmetric peristaltic Carreau-Yasuda nanofluid flow in a vertical and tapered wavy channel is demonstrated and the mixed heat transfer analysis is considered for it. For the modeling, two-phase method is considered to be able to study the nanoparticles concentration as a separate phase. Also it is assumed that peristaltic waves travel along X-axis at a constant speed, c. Furthermore, constant temperatures and constant nanoparticle concentrations are considered for both, left and right walls. This study aims at an analytical solution of the problem by means of least square method (LSM) using the Maple 15.0 mathematical software. Numerical outcomes will be compared. Finally, the effects of most important parameters (Weissenberg number, Prandtl number, Brownian motion parameter, thermophoresis parameter, local temperature and nanoparticle Grashof numbers) on the velocities, temperature and nanoparticles concentration functions are presented. As an important outcome, on the left side of the channel, increasing the Grashof numbers leads to a reduction in velocity profiles, while on the right side, it is the other way around.

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Thermal analysis of 2.5-D package designs with joule heating effect along TSVs

2014 15th International Conference on Electronic Packaging Technology ◽

10.1109/icept.2014.6922751 ◽

2014 ◽

Author(s):

H. Y. Zhang

Keyword(s):

Thermal Analysis ◽

Joule Heating ◽

Heating Effect ◽

Joule Heating Effect

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Finite element analysis of vertical micro-probe considering Joule-heating effect

International Journal of Fatigue ◽

10.1016/j.ijfatigue.2017.02.021 ◽

2017 ◽

Vol 101 ◽

pp. 96-105 ◽

Cited By ~ 2

Author(s):

Hyun-Woo Jung ◽

Seung-Jae Kim ◽

Yun-Jae Kim ◽

Jung-Yup Kim ◽

Joo-Yul Lee ◽

...

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Joule Heating ◽

Heating Effect ◽

Element Analysis ◽

Joule Heating Effect

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Flow control in microfluidics devices: electro-osmotic Couette flow with joule heating effect

Frontiers in Engineering and Built Environment ◽

10.1108/febe-03-2021-0020 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

C. Ahamed Saleel ◽

Saad Ayed Alshahrani ◽

Asif Afzal ◽

Maughal Ahmed Ali Baig ◽

Sarfaraz Kamangar ◽

...

Keyword(s):

Flow Control ◽

Couette Flow ◽

Joule Heating ◽

Dynamic Viscosity ◽

Microfluidic Devices ◽

Heating Effect ◽

Content Type ◽

Osmotic Flow ◽

Joule Heating Effect ◽

Electro Osmotic Flow

PurposeJoule heating effect is a pervasive phenomenon in electro-osmotic flow because of the applied electric field and fluid electrical resistivity across the microchannels. Its effect in electro-osmotic flow field is an important mechanism to control the flow inside the microchannels and it includes numerous applications.Design/methodology/approachThis research article details the numerical investigation on alterations in the profile of stream wise velocity of simple Couette-electroosmotic flow and pressure driven electro-osmotic Couette flow by the dynamic viscosity variations happened due to the Joule heating effect throughout the dielectric fluid usually observed in various microfluidic devices.FindingsThe advantages of the Joule heating effect are not only to control the velocity in microchannels but also to act as an active method to enhance the mixing efficiency. The results of numerical investigations reveal that the thermal field due to Joule heating effect causes considerable variation of dynamic viscosity across the microchannel to initiate a shear flow when EDL (Electrical Double Layer) thickness is increased and is being varied across the channel.Originality/valueThis research work suggest how joule heating can be used as en effective mechanism for flow control in microfluidic devices.

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