Laminar fluid behavior in microchannels using micropolar fluid theory

Papautsky, Ian; Brazzle, John D.; Ameel, Tim; Frazier, A. Bruno

doi:10.1016/s0924-4247(98)00261-1

Cited by 243 publications

(169 citation statements)

References 28 publications

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“…The conduction thermal resistance corresponding to the stain less steel plate is given in Eq. (12). The thermal conductivity ð k s Þ is evaluated at the average temperature of the steel, which can be obtained from the average temperatures of both fluids.…”

Section: Thermal Effectiveness Of the Micro Heat Exchangersmentioning

confidence: 99%

“…Finally, other effects have also been stated in the literature, such as the presence of incondensables (Ghiaasiaan and Laker [11]), the micropolar theory (Papautsky et al [12]), the viscous dissipation (Tso and Mahulikar [13 15]) and the electrical double layer, EDL (Mala et al [16], Yang and Li [17,18] and Li [19]). Nevertheless, and as Steinke and Kandlikar [6] stated, all these last factors can be neglected for microchannels with diameters larger than 10 lm.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of fluid flow and heat transfer in a single-phase liquid flow micro-heat exchanger

García-Hernando

Acosta-Iborra

Ruiz-Rivas

et al. 2009

International Journal of Heat and Mass Transfer

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a b s t r a c tThis work presents an experimental analysis of the hydrodynamic and thermal performance of micro heat exchangers. Two micro heat exchangers, characterized by microchannels of 100 Â 100 and 200 Â 200 lm square cross sections, were designed for that purpose. The fluid used was deionized water and there was no phase change along the fluid circuit. The fluid pressure drop along the heat exchanger and the heat transfer were measured and corrections were made to isolate the contribution of the micro channels. The results were compared with the predictions of the classical viscous flow and heat transfer theory. The main conclusions show that the experimental results fit well with these theories. No effects of heat transfer enhancement or pressure drop increase were observed as a consequence of the small scale of the microchannels.

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Section: Thermal Effectiveness Of the Micro Heat Exchangersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental investigation of fluid flow and heat transfer in a single-phase liquid flow micro-heat exchanger

García-Hernando

Acosta-Iborra

Ruiz-Rivas

et al. 2009

International Journal of Heat and Mass Transfer

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“…2 For the liquid flow in a microscale channel, several typical experiments have been reported recently, however, the results are not always consistent. 3- 8 Pfahler et al 7 measured the friction factor of isopropanol in a microchannel ͑100 m in width, less than 40 m in depth and with a hydraulic diameter of 39.7 m͒, and found that the apparent viscosity became smaller than that in the macroscale. On the other hand, in Papautsky's 8 experiments with water ͑Reynolds numberϭ0.001-18 and hydraulic diameterϭ57 m), it was found that the experimental flow rate was smaller than the value predicted by the classical theory by a factor of 1.2.…”

Section: Introductionmentioning

confidence: 99%

“…3- 8 Pfahler et al 7 measured the friction factor of isopropanol in a microchannel ͑100 m in width, less than 40 m in depth and with a hydraulic diameter of 39.7 m͒, and found that the apparent viscosity became smaller than that in the macroscale. On the other hand, in Papautsky's 8 experiments with water ͑Reynolds numberϭ0.001-18 and hydraulic diameterϭ57 m), it was found that the experimental flow rate was smaller than the value predicted by the classical theory by a factor of 1.2. Recently, Sharp et al 9 carried out systematic experiments for water and isopropanol in microtubes ͑Reynolds numberϭ50-1500 and hydraulic diameterϭ75 m-242 m), whose results were in good agreement with the classical theory.…”

Section: Introductionmentioning

confidence: 99%

Flow characteristics of liquids in microtubes driven by a high pressure

Cui¹,

Silber-Li²,

Zhu³

2004

Physics of Fluids

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The flow characteristics of liquids in microtubes driven by a high pressure ranging from 1 MPa to 30 MPa are studied in this paper. The diameter of the microtube is from 3 m to 10 m and liquids composed of simple small molecules are chosen as the working fluids. The Reynolds number ranges from 0.1 to 24. The behavior of isopropanol and carbon tetrachloride under high pressure is found different from the prediction from conventional Hagen-Poiseuille ͑HP͒ equation. The normalized friction coefficient C* increases significantly with the pressure. From an analysis of the microtube deformation, liquid compressibility, viscous heating and wall slip, it may be seen that the viscosity at high pressure plays an important role here. An exponential function of viscosity vs pressure is introduced into the HP equation to counteract the difference between experimental and theoretical values. However, this difference is not so marked for di-water.

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“…For examples, the problem on micropolar fluid, viscoelastic fluid, and Jeffrey fluid. There are various models that have been proposed in the existing literature due to the complex structure of non-Newtonian fluids [1][2][3][4][5][6][7][8][9][10][11][12]. Recently, the phenomena of flow and heat transfer on non-Newtonian fluid have received considerable attention due to the practical importance applications in engineering and several industrial-manufacturing processes involving petroleum drilling, manufacturing of foods as well as papers.…”

Section: Introductionmentioning

confidence: 99%