Effect of Using Porous Inserts on Natural Convection Heat Transfer Between Two Concentric Vertical Cylinders

Kiwan, Suhil; Alzahrany, Mohammed

doi:10.1080/10407780701715869

Cited by 36 publications

(13 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The comparison is excellent with maximum error less than 1 %. It should be noted that Kiwan and Alzahrany (2008) presented other validation studies for natural convection cases (Fig. 3).…”

Section: Porous Layermentioning

confidence: 93%

“…Mixed convection heat transfer in a two-dimensional rectangular cavity with constant flux from partially heated bottom wall while the isothermal sidewalls are moving in the vertical direction was studied numerically by Guo and Sharif (2004). Kiwan and Alzahrany (2008) studied the effect of using porous insert on natural convection heat transfer between two concentric vertical cylinders. They found that the heat transfer characteristic could be significantly affected by the presence of porous inserts.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mixed Convection Heat Transfer in the Annulus Between Two Concentric Vertical Cylinders Using Porous Layers

Zahrani

Kiwan

2008

Transp Porous Med

Self Cite

View full text Add to dashboard Cite

A numerical investigation of the steady-state, laminar, axi-symmetric, mixed convection heat transfer in the annulus between two concentric vertical cylinders using porous inserts is carried out. The inner cylinder is subjected to constant heat flux and the outer cylinder is insulated. A finite volume code is used to numerically solve the sets of governing equations. The Darcy-Brinkman-Forchheimer model along with Boussinesq approximation is used to solve the flow in the porous region. The Navier-Stokes equation is used to describe the flow in the clear flow region. The dependence of the average Nusselt number on several flow and geometric parameters is investigated. These include: convective parameter, λ, Darcy number, Da, thermal conductivity ratio, K r , and porous-insert thickness to gap ratio (H/D). It is found that, in general, the heat transfer enhances by the presence of porous layers of high thermal conductivity ratios. It is also found that there is a critical thermal conductivity ratio on which if the values of Kr are higher than the critical value the average Nusselt number starts to decrease. Also, it found that at low thermal conductivity ratio (K r ≈ 1) and for all values of λ the porous material acts as thermal insulation.Keywords Mixed convection · Porous media · Darcy-Brinkman-Forchheimer model · Heat transfer · Critical thermal conductivity ratio Nomenclature C F Forchheimer coefficient , C F = 1.75/ 150φ 5 C p Specific heat (J kg −1 K −1 ) D Gap between the two concentric cylinders (r o − r i ) [m] Da Darcy number (K /D 2 )

show abstract

“…The comparison is excellent with maximum error less than 1 %. It should be noted that Kiwan and Alzahrany (2008) presented other validation studies for natural convection cases (Fig. 3).…”

Section: Porous Layermentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Mixed Convection Heat Transfer in the Annulus Between Two Concentric Vertical Cylinders Using Porous Layers

Zahrani

Kiwan

2008

Transp Porous Med

Self Cite

View full text Add to dashboard Cite

show abstract

“…Various active and passive methods were proved to enhance the rate of heat transfer such as nanofluids [1], fins [2], porous inserts [3,4], etc.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the effects of acoustic streaming of high frequency ultrasonic waves on convective heat transfer: Effects of transducer position and wave interference

Rahimi

Dehbani

Abolhasani

2012

International Communications in Heat and Mass Transfer

View full text Add to dashboard Cite

“…Few numerical works are available for the analysis of both steady [21][22][23][24] and transient [25][26][27] natural convection in partially porous annuli; the available time dependent solutions deal with open-ended [25], and with closed [26][27] vertical partially porous annuli with vertical porous inserts with variable properties and positions. These works focused on the stability of the flow in the cavity for high values of Darcy number, without providing any detailed sensitivity analysis of the influence of the porous layer on the transient heat transfer for low values of Da.…”

Section: Introductionmentioning

confidence: 99%

Influence of one porous layer insert on the transient heat transfer in a tall annulus in presence of large source terms

Arpino¹,

Ciccolella²,

Cortellessa³

et al. 2017

IJHT

View full text Add to dashboard Cite

This paper provides a sensitivity analysis on the influence of one porous layer insert on the transient behavior of natural convection in a tall annular enclosure in presence of large source terms. The porous medium which partially fills the cavity is characterized by a low value of the Darcy number, typical of insulating materials and metallic foams, often employed in heat exchangers and other engineering applications. A stabilized, fully explicit version of the Compressibility Based Scheme is here employed and validated against experimental data available in the scientific literature for steady and unsteady convection in vertical cylindrical enclosures. Several analyses are presented here by changing both the geometrical features of the cavity and the properties of the porous domain. The results of these analyses demonstrate that not only the thermo-physical properties of the porous medium but also the position and the thickness of the porous layer strongly affect the transient behavior of the convective phenomena occurring in the cavity.

show abstract

Effect of Using Porous Inserts on Natural Convection Heat Transfer Between Two Concentric Vertical Cylinders

Cited by 36 publications

References 11 publications

Mixed Convection Heat Transfer in the Annulus Between Two Concentric Vertical Cylinders Using Porous Layers

Mixed Convection Heat Transfer in the Annulus Between Two Concentric Vertical Cylinders Using Porous Layers

Experimental study on the effects of acoustic streaming of high frequency ultrasonic waves on convective heat transfer: Effects of transducer position and wave interference

Influence of one porous layer insert on the transient heat transfer in a tall annulus in presence of large source terms

Contact Info

Product

Resources

About