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Browsing by UP Author "Everts, Marilize"

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The effect of high values of relative surface roughness on heat transfer and pressure drop characteristics in the laminar, transitional, quasi-turbulent and turbulent flow regimes

Everts, Marilize; Mahomed, Faiyaad (Springer, 2024-07)

This study investigated the effect of large values of relative surface roughness on the heat transfer and pressure drop characteristics using simultaneously measured heat transfer and pressure drop data. Experiments were ...
The effective use of focused shadowgraphy for single bubble nucleate pool boiling investigations

Everts, Marilize; Welzl, M.; Brüggemann, D. (Institute of Physics, 2024-06)

Nucleate pool boiling is known for its high heat transfer coefficients. Despite being widely implemented, the prediction of nucleate pool boiling mechanisms remains complex and single bubble heat transfer analysis is ...
The effects of surface roughness on fully developed laminar and transitional flow friction factors and heat transfer coefficients in horizontal circular tubes

Everts, Marilize; Robbertse, Pascal; Spitholt, Blayne (Elsevier, 2022-06)

Although the effect of surface roughness on internal forced convection is considered a mature field, very limited work has been done focussing on the effect of surface roughness in the laminar and transitional flow regimes, ...
Flow regime maps for smooth horizontal tubes at a constant heat flux

Everts, Marilize; Meyer, Josua P. (Elsevier, 2018-02)

The existing constant heat flux boundary condition flow regime maps are accurate for high Prandtl number fluids, however, they are inaccurate at lower Prandtl numbers and tube diameters and specifically for water as the ...
Heat transfer and pressure drop characteristics of alternating clockwise and counter clockwise twisted tape inserts in the transitional flow regime

Abolarin, S.M. (Sogo); Everts, Marilize; Meyer, Josua P. (Elsevier, 2019-04)

The purpose of this study was to experimentally investigate the heat transfer and pressure drop characteristics in a smooth circular tube with alternating clockwise and counter clockwise twisted tape (CCCTT) inserts. The ...
Heat transfer characteristics of assisting and opposing laminar flow through a vertical circular tube at low Reynolds numbers

Everts, Marilize; Bhattacharyya, Suvanjan; Bashir, Abubakar Idris; Meyer, Josua P. (Elsevier, 2020-10)

Owing to its importance in industrial applications, many studies investigated mixed convective flow through vertical tubes. These studies usually considered tubes with relatively large diameters and short lengths. The ...
Heat transfer coefficients for quasi-turbulent and turbulent flow in solar receiver tubes

Everts, Marilize; Meyer, Josua P. (American Institute of Physics, 2019-07-26)

Several well-known correlations to determine the heat transfer coefficients of quasi-turbulent and turbulent flow in smooth tubes are available in literature. However, when the results of these correlations are compared ...
Heat transfer coefficients of laminar, transitional, quasi-turbulent and turbulent flow in circular tubes

Meyer, Josua P.; Everts, Marilize; Coetzee, Nicole; Grote, Kersten; Steyn, M. (Elsevier, 2019-06)

Several well-known correlations to determine the heat transfer coefficients of quasi-turbulent and turbulent flow in smooth tubes are available in literature. However, when these correlations are compared with each other, ...
Heat transfer of developing and fully developed flow in smooth horizontal tubes in the transitional flow regime

Everts, Marilize; Meyer, Josua P. (Elsevier, 2018-02)

Limited experimental work has been done specifically focussing on how the heat transfer characteristics of developing flow in the transitional flow regime changes along the tube length, and how it compares with fully ...
Influence of inlet contraction ratios on the heat transfer and pressure drop characteristics of single-phase flow in smooth circular tubes in the transitional flow regime

Bashir, Abubakar Idris; Everts, Marilize; Meyer, Josua P. (Elsevier, 2019-12)

An experimental investigation of the single-phase heat transfer and pressure drop characteristics in the transitional flow regime has been performed using flow-calming sections with different inlet geometries and section-to-tube ...
The influence of peripheral u-cut twisted tapes and ring inserts on the heat transfer and pressure drop characteristics in the transitional flow regime

Abolarin, S.M. (Sogo); Everts, Marilize; Meyer, Josua P. (Elsevier, 2019-04)

The purpose of this study was to experimentally investigate the heat transfer and pressure drop enhancement characteristics in a smooth circular copper tube with peripheral u-cut twisted tape (PUCTT) inserts without and ...
Inlet tube spacing and protrusion inlet effects on multiple circular tubes in the laminar, transitional and turbulent flow regimes

Meyer, Josua P.; Everts, Marilize; Hall, Andrew T.C.; Mulock-Houwer, Franscois A.; Joubert, Martin; Pallent, Leslie M.J.; Vause, Erin S. (Elsevier, 2018-03)

The purpose of this study was to investigate inlet tube spacing and protrusion effects on multiple circular tubes in the laminar, transitional and turbulent flow regimes. An experimental set-up was built for this investigation ...
Laminar hydrodynamic and thermal entrance lengths for simultaneously hydrodynamically and thermally developing forced and mixed convective flows in horizontal tubes

Everts, Marilize; Meyer, Josua P. (Elsevier, 2020-10)

Correlations to predict the hydrodynamic and thermal entrance lengths in a smooth horizontal tube heated at a constant heat flux are often restricted to forced convection conditions. The reason being that most scholars do ...
The local heat transfer characteristics associated with mixed convective developing flow through a horizontal tube exposed to a uniform wall temperature boundary condition

Coetzee, Mark J.; Steyn, Deniel; Everts, Marilize (Elsevier, 2024-09)

Extensive research has been conducted on the heat transfer characteristics related to the boundary conditions present in phase-change applications. However, there remains a fundamental gap in understanding the local heat ...
Nucleate pool boiling bubble dynamics for R32 and R1234yf on machined micro-structured surfaces

Van den Bergh, Wilhelm Johann; Whiting, Mitchell; Theodorakis, O.E.; Everts, Marilize (Elsevier, 2024-12)

Efficient electronics cooling has always been a perpetual challenge, with the limits of single-phase cooling almost being reached. Two-phase cooling in the form of pool boiling is an attractive next step, with much research ...
Relationship between pressure drop and heat transfer of developing and fully developed flow in smooth horizontal circular tubes in the laminar, transitional, quasi-turbulent and turbulent flow regimes

Everts, Marilize; Meyer, Josua P. (Elsevier, 2018-02)

Limited work has been done specifically focussing on the relationship between pressure drop and heat transfer in the transitional flow regime. The purpose of this study was therefore to experimentally investigate and compare ...
A review of the recent developments in laminar, transitional, quasi-turbulent and turbulent forced and mixed convective flow through horizontal tubes

Meyer, Josua P.; Everts, Marilize (Elsevier, 2019)

he laminar and turbulent flow regimes have been extensively investigated from as early as 1883, and research has been devoted to the transitional flow regime since the 1990s. However, there are several gaps in the mixed ...
Simultaneous development of the hydrodynamic and thermal boundary layers of mixed convective laminar flow through a horizontal tube with a constant heat flux

Everts, Marilize; Mahdavi, Mostafa; Sharifpur, Mohsen; Meyer, Josua P. (Elsevier, 2023-05)

The thermal and hydrodynamic features of developing mixed convective laminar flow in a long horizontal tube were numerically and experimentally investigated. The tube was heated at different constant heat fluxes and had ...
Single-phase forced convection heat transfer and pressure drop in circular tubes in the laminar and transitional flow regimes

Bashir, Abubakar Idris; Everts, Marilize; Bennacer, R.; Meyer, Josua P. (Elsevier, 2019-12)

Forced convection experiments are challenging to perform in smooth horizontal circular tubes, because very low heat fluxes are required to ensure that the buoyancy effects do not enhance the heat transfer coefficients. ...
Single-phase mixed convection of developing and fully developed flow in smooth horizontal circular tubes in the laminar and transitional flow regimes

Meyer, Josua P.; Everts, Marilize (Elsevier, 2018-02)

Correlations to calculate the local and average heat transfer coefficients for single-phase laminar flow in horizontal circular tubes with a constant heat flux boundary condition are usually restricted to fully developed ...

Browsing by UP Author "Everts, Marilize"

Browsing by UP Author "Everts, Marilize"

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