Search Results - "Dirker, J"

Numerical simulation of condensation inside an inclined smooth tube by Abadi, S.M.A. Noori Rahim, Meyer, J.P., Dirker, J.

“…•3D numerical simulation is performed for condensing flow inside inclined tube.•Heat transfer rate is maximum at inclination angle of between −30° and −15°.•At…”
Get full text

Experimental and Numerical Investigation of Micro/Mini Channel Flow-Boiling Heat Transfer with Non-Uniform Circumferential Heat Fluxes at Different Rotational Orientations by Vermaak, M, Potgieter, J, Dirker, J, Moghimi, M A, Valluri, P, Sefiane, K, Meyer, J P

“…•Heat transfer coefficients in microchannels affected by rotational orientation•Secondary buoyancy driven flow was observed experimentally and…”
Get full text

Influence of non-steady transient heat flux on flow boiling heat transfer and pressure drop in horizontal pipes by Van den Bergh, W.J., Dirker, J., Markides, C.N., Meyer, J.P.

“…•Simulated DNI informed by real data was applied as a heat flux onto a horizontal pipe.•Step, sinusoidal, and triangular/ramp waveforms were used.•Step…”
Get full text

Effect of low heat and mass fluxes on the boiling heat transfer coefficient of R-245fa by Van den Bergh, W.J., Moran, H.R., Dirker, J., Markides, C.N., Meyer, J.P.

“…In-tube flow boiling at low mass and heat fluxes is of increasing interest particularly for low-concentration solar power systems, refrigerators, heat pumps,…”
Get full text

An experimental study of the thermohydraulic characteristics of flow boiling in horizontal pipes: Linking spatiotemporally resolved and integral measurements by Moran, H.R., Zogg, D., Voulgaropoulos, V., Van den Bergh, W.J., Dirker, J., Meyer, J.P., Matar, O.K., Markides, C.N.

“…Data are presented from experiments of flow boiling in a horizontal pipe. Specifically, refrigerant R245fa was evaporated in a 12.6 mm stainless steel pipe to…”
Get full text

Influence of inlet vapour quality perturbations on the transient response of flow-boiling heat transfer by Dirker, J., van den Bergh, W.J., Moran, H.R., Markides, C.N., Meyer, J.P.

“…•Concentrated solar power parabolic trough experimental facility constructed.•Heat transfer coefficient for simulated transient direct normal irradiation…”
Get full text

Experimental analysis for thermal storage performance of three types of plate encapsulated phase change materials in air heat exchangers for ventilation applications by Kumirai, T., Dirker, J., Meyer, J.

“…Due to climate change and rising global temperatures, energy demand associated with commercial and office building cooling, is projected to increase…”
Get full text

Effect of inclination angle on the condensation of R134a inside an inclined smooth tube by Noori Rahim Abadi, S.M.A., Meyer, Josua P., Dirker, J.

“…•The inclination effect on void fraction is negligible at high mass fluxes.•The inclination effect on void fraction is negligible at high vapour qualities.•The…”
Get full text

Effect of saturation temperature on the condensation of R134a inside an inclined smooth tube by Abadi, S.M.A. Noori Rahim, Mehrabi, M., Meyer, Josua P., Dirker, J.

“…•Effect of the inclination angle on the heat transfer coefficient and pressure drop.•Condensation heat transfer coefficient increased with increasing mass flux…”
Get full text

Three-dimensional multi-scale plate assembly for maximum heat transfer rate density by Bello-Ochende, T., Meyer, J.P., Dirker, J.

“…This paper extends the design concept for generating multi-scale structures in forced convection for a finite-size flow system to a three-dimensional…”
Get full text

Thermal characterisation of embedded heat spreading layers in rectangular heat-generating electronic modules by Dirker, J., Meyer, J.P.

“…The cooling performance of heat spreading layers, consisting of materials that have relatively high thermal conductivity embedded into heat-generating mediums,…”
Get full text

Implementation of Liquid Crystal Thermography to Determine Wall Temperatures and Heat Transfer Coefficients in a Tube-in-tube Heat Exchanger by van der Westhuizen, J. E., Dirker, J., Meyer, J. P.

“…Liquid crystal thermography was used in a water-operated concentric tube-in-tube heat exchanger to determine local annular heat transfer coefficients at the…”
Get full text

A computational fluid dynamics model for investigating air flow patterns in underground coal mine sections by Ndenguma, D D, Dirker, J, Burger, N DL

“…This investigation compares the results from an experimental and numerical study of air flow in a scaled-down underground coal mine model. This was done in…”
Get full text

Convective Heat Transfer Coefficients in Concentric Annuli by DIRKER, J., MEYER, J. P.

“…The geometric shape of a passage's cross-section has an effect on its convective heat transfer capabilities. For concentric annuli, the diameter ratio of the…”
Get full text

Power Density Improvement in Integrated Electromagnetic Passive Modules With Embedded Heat Extractors by Wenduo Liu, Dirker, J., van Wyk, J.D.

“…In this paper, heat extractors are embedded into the magnetic materials of the integrated power electronics passive modules. The optimum volume of…”
Get full text

Influence of different circumferential heat flux distributions on flow boiling of R245fa in a circular horizontal tube by Martin, A.T., Dirker, J.

Get full text

Embedded solid State heat extraction in integrated power electronic modules by Dirker, J., Wenduo Liu, Van Wyk, J.D., Malan, A.G., Meyer, J.P.

“…The use of embedded solid-state heat extractors to increase the power densities in power electronic modules seems promising. Cross-sectional geometric…”
Get full text

Experimental study of entropy generation during condensation in inclined enhanced tubes by Adelaja, A.O., Dirker, J., Meyer, J.P.

“…•Inclination angle, mass velocity, and quality affect entropy generation rates.•There exist optimal inclination angles for minimum entropy…”
Get full text

Influence of ring type flow turbulators on the local heat transfer coefficients in an annular passage – An experimental and numerical investigation by Dirker, J., Meyer, J.P., Steyn, R.M.

“…In this experimental and numerical investigation, the use of circular cross sectioned ring-type flow turbulators was considered as a method to increase local…”
Get full text

Topology optimization for the conduction cooling of a heat-generating volume with orthotropic material by Page, L.G., Dirker, J., Meyer, J.P.

“…•Topology optimization of conduit paths distributed with-in a heat-generating volume.•Isotropic and orthotropic conduit and heat-generating materials are…”
Get full text