Friction and forced convective heat transfer in a sintered porous channel with obstacle blocks

Tzeng, Sheng‐Chung; Ma, Weiping; Wang, Yen-Chan

doi:10.1007/s00231-006-0149-z

Cited by 4 publications

(3 citation statements)

References 24 publications

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“…where f g and f l are friction factors for the vapor and the liquid states of CO 2 , respectively; L g and L l are the lengths of the cooling (vapor state) and the subcooling (liquid state) regions, respectively; V g and V l are the velocities of vapor and liquid state of CO 2 (m s 1 ), respectively; Downloaded by [University of Kent] at 08:18 19 November 2014 g and l are the densities of the vapor state and liquid state of CO 2 (kg m 3 ), respectively; g and L are the viscosities of the vapor state and liquid state of CO 2 (Pa.s), respectively; C is the inertia coefficient for spherical particles with mean diameter d m , as presented by [11], and is equal to…”

Section: Calculation Of Carbon Dioxide Pressure Drop During Condensatmentioning

confidence: 99%

The Effect of Heat Exchanger Type on Two-Phase Heat Transfer Coefficient and Pressure Drop

Alshqirate

2012

Experimental Heat Transfer

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Three different types of heat exchangers were tested experimentally to investigate two-phase heat transfer coefficient and pressure drop during the condensation process of CO 2 gas. Experimental results revealed that the convection heat transfer coefficient was enhanced by a factor of four due to the existence of porous media and by a factor of seven due to the use of micro-pipes when compared to the normal macro-tubes. The pressure drop was measured and noticed only in porous tubes and micro-pipes, reaching about 17.5 kPa/m and 8.4 kPa/m, respectively. Comparisons between experimental and correlated results were conducted.

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Section: Calculation Of Carbon Dioxide Pressure Drop During Condensatmentioning

confidence: 99%

The Effect of Heat Exchanger Type on Two-Phase Heat Transfer Coefficient and Pressure Drop

Alshqirate

2012

Experimental Heat Transfer

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“…where C is the inertia coefficient for spherical particles with mean diameter (d m ) [9] and is equal:…”

Section: Pressure Drop During the Condensation Processmentioning

confidence: 99%

“…Pettersen et al [8] investigated the development of compact heat exchangers for CO 2 air-conditioning systems. Sheng-Chung et al [9] studied friction and forced convective heat transfer in a sintered porous channel with obstacle blocks. Teamah et al [10] performed a numerical simulation of laminar forced convection in a horizontal pipe partially filled with porous material.…”

Section: Introductionmentioning

confidence: 99%

Effect of Darcy, Reynolds, and Prandtl Numbers on the Performance of Two‐Phase Flow Heat Exchanger Filled with Porous Media

Tarawneh

Alshiqirate

Jawarneh

2013

Heat Trans. Asian Res.

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Experimental investigation of two-phase laminar forced convection in a single porous tube heat exchanger is presented. The effect of Darcy, Reynolds, and Prandtl numbers on the performance of this heat exchanger during the condensation process of carbon dioxide at different test conditions were investigated. Gravel sand with different porosities is used as a porous medium. The flow in the porous medium is modeled using the Brinkman-Forchheimer-extended Darcy model. Parametric studies are also conducted to evaluate the effects of porosity and Reynolds and Prandtl numbers on the heat transfer coefficient and the friction factor. A dimensionless performance parameter is developed in order to be used in evaluating the porous tube heat exchanger based on both the heat transfer enhancement and the associated pressure drop. The study covers a wide range of inlet pressure (P in ), mass flow rate (m . ), porosity of gravel sand (ε), and Darcy number (Da) which ranged: 34.5 ≤ P in ≤ 43 bars, 8*10 -5 ≤ m . ≤ 16*10 -5 kg/s, 34.9% ≤ ε ≤ 44.5%, 1.6*10 -6 ≤ Da ≤ 5*10 -6 , respectively. The study predicted the combined effect of the Reynolds number, Darcy number, porosity, and Prandtl number on the heat transfer and pressure drop of carbon dioxide during the condensation process in a porous medium.

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Experimental study on the effect of porous medium on performance of a single tube heat exchanger: A CO₂ case study

Tarawneh

Alshqirate

Khasawneh

et al. 2013

Heat Trans. Asian Res.

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An experimental study on single‐phase laminar forced convection in a single porous tube heat exchanger is presented. Parametric studies are conducted for different inlet pressures, different mass flow rates, and different porosities to evaluate the effects of particle diameter and Reynolds number on the heat transfer and friction factor. The Nusselt number and friction factor are developed for efficient design of a porous heat exchanger based on the present configuration. Heat is transferred to the walls of the heat exchanger by natural convection mode. Gravel sand with different porosities is used as a porous medium during the tests. The flow of carbon dioxide as a working fluid in the porous medium is modeled using the Brinkman–Forchheimer‐extended Darcy model. A dimensionless performance parameter is developed in order to be used in evaluating the porous tube heat exchanger based on both the heat transfer enhancement and the associated pressure drop. The study covers a wide range of inlet pressures (Pi), mass flow rates ( $\dot{m}$), porosity of gravel sand (ε), and particle diameters (dm) which ranged 34.5 ≤ Pi ≤ 43 bars, 8 ∗︁ 10−5 ≤$\dot{m}$ ≤ 16 ∗︁ 10−5 kg/s, 34.9% ≤ ε ≤ 44.5%, 1.25 ≤ dm ≤ 5.15 mm, respectively. This study revealed that a smaller particle diameter can be used to achieve higher heat transfer enhancement, but a larger particle diameter leads to a more efficient performance based on heat transfer enhancement. The average heat transfer coefficient of carbon dioxide decreases when the porosity increases. © 2013 Wiley Periodicals, Inc. Heat Trans Asian Res; Published online in Wiley Online Library (wileyonlinelibrary.com/journal/htj). DOI 10.1002/htj.21059

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Friction and forced convective heat transfer in a sintered porous channel with obstacle blocks

Cited by 4 publications

References 24 publications

The Effect of Heat Exchanger Type on Two-Phase Heat Transfer Coefficient and Pressure Drop

The Effect of Heat Exchanger Type on Two-Phase Heat Transfer Coefficient and Pressure Drop

Effect of Darcy, Reynolds, and Prandtl Numbers on the Performance of Two‐Phase Flow Heat Exchanger Filled with Porous Media

Experimental study on the effect of porous medium on performance of a single tube heat exchanger: A CO₂ case study

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Friction and forced convective heat transfer in a sintered porous channel with obstacle blocks

Cited by 4 publications

References 24 publications

The Effect of Heat Exchanger Type on Two-Phase Heat Transfer Coefficient and Pressure Drop

The Effect of Heat Exchanger Type on Two-Phase Heat Transfer Coefficient and Pressure Drop

Effect of Darcy, Reynolds, and Prandtl Numbers on the Performance of Two‐Phase Flow Heat Exchanger Filled with Porous Media

Experimental study on the effect of porous medium on performance of a single tube heat exchanger: A CO2 case study

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Product

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Experimental study on the effect of porous medium on performance of a single tube heat exchanger: A CO₂ case study