Showing papers in "Experimental Thermal and Fluid Science in 2015"

TL;DR: In this paper, several researches on the micro/nanostructured surfaces that have been designed to enhance boiling heat transfer are introduced and closely reviewed, and the special features of the existing surfaces capable of enhancing BoT are summarized.

TL;DR: In this paper, the results reported in recent investigations on pool boiling and flow boiling from micro/nanostructured surfaces were included, and a comprehensive overview was provided. But, the results of these studies were limited to the micro and nano scale.

TL;DR: The results suggest that the multivariate complex network analysis allows quantitatively uncovering the transitions of distinct flow patterns and yields deep insights into the nonlinear dynamic behavior underlying gas–liquid flows.

TL;DR: In this paper, the trajectory of a single bubble in water and glycerol aqueous solution was determined by analyzing the bubble characteristics in two-dimensional plane captured by a single high-speed camera and the bubble trajectory in the water was ascertained by this method.

TL;DR: In this article, an extensive review of numerical and experimental studies on heat transfer enhancement, which covers the laminar and turbulent flow regions in the corrugations, especially in corrugated tubes, is presented.

TL;DR: In this paper, the authors present the results of an experimental study on the use of Fe 2 O 3 /Kerosene nanofluid for the copper oscillating heat pipe under the magnetic field.

TL;DR: In this article, the authors verified the feasibility of triggering a continuously rotating detonation wave (CRDW) in a unique hollow combustion chamber through annular injection distribution, which is the essential condition for sustaining a stable CRDW.

TL;DR: In this paper, the forced convective heat transfer coefficient of a biologically produced nanofluid flowing in a circular tube inside a heat exchanger was investigated and a new correlation was proposed with absolute average deviation of 3.43.

TL;DR: In this paper, a simultaneous measurement technique based on planar laser-induced fluorescence imaging (PLIF) and particle image/tracking velocimetry (PIV/PTV) is described for the investigation of the hydrodynamic characteristics of harmonically excited liquid thin-film flows.

TL;DR: In this paper, the convective heat transfer coefficient and friction factor for fully developed turbulent flow of graphene nanoplatelet (GNP) nanofluids of varying specific surface areas flowing through a horizontal stainless steel tube with a uniform heat flux are experimentally determined.

TL;DR: In this article, a hydrophobic coating with a static contact angle of 147° was obtained using an aluminate coupling agent on an aluminum (Al) surface, and it was found that the frost deposition was delayed for 60min, when compared to a neat Al surface.

TL;DR: In this article, a thin aluminum foil was attached to the surface of a transparent Venturi section using two-sided transparent adhesive tape, which revealed that the surface was very soft and prone to be severely damaged by cavitation.

TL;DR: In this article, an experimental investigation is conducted on the convective boiling of dilute CuO-water nanofluids in an upward flow inside the conventional heat exchanger.

TL;DR: In this article, the authors quantify and compare the natural convection heat transfer enhancement of perforated fin array with different perforation diameter (4-12mm) and at different angles of inclination (0-90°).

TL;DR: In this paper, an experimental study was carried out on heat transfer characteristics of a nano-refrigerant flow during condensation inside a horizontal smooth tube, and significant heat transfer enhancement was achieved by adding nanoparticles to the baseline mixture and pure refrigerant.

TL;DR: In this article, the second-law based thermodynamic analysis is employed to analyze the effects of baffle helix angle on the irreversible loss of heat exchangers, and the results indicate that the shell-side pressure drop and heat transfer coefficient of the heat exchanger with smaller helix angles are higher than those with larger helix-angle at a given shell side volume flow rate.

TL;DR: In this article, an overview of the literature on laboratory-scale swirl flame burners is presented, focusing on selected gaseous fuel burners that span premixed, partially premixed and non-premixed combustion over unconfined and confined conditions.

TL;DR: In this paper, a vertical stainless steel test section (1.60mm inside diameter and 245mm heated length) under upward flow conditions was used to compare boiling heat transfer, pressure drop and dryout characteristics of R1234yf and R134a.

TL;DR: In this article, the effects of ferrofluids on the forced convective heat transfer in a tube with a round cross section under constant heat flux in the laminar flow regime are investigated experimentally.

TL;DR: In this paper, the authors investigated the performance of twisted-tape inserts with variable twist lengths in the presence of Cu-water nanofluid at 0, 0.1, and 0.3% concentration.

TL;DR: In this article, a comparative experimental and numerical study was conducted to investigate the heat transfer of turbulent flow in channels with one dimpled wall with arrays of spherical and teardrop dimples, and the dimples have the same depth with depth-to-diameter ratio of 0.2.

TL;DR: In this article, continuous rotating detonation wave (CRDW) traveling azimuthally in the annular detonation combustor and DW propagating along the combustor axial direction were found, and experiments showed that the DW could be sustained continuously and steadily in all the five patterns within annular combustor, requiring no repeated ignition.

TL;DR: In this paper, a U-bend heat exchanger with and without helical tape inserts in the inner tube was studied experimentally, and the experiments were conducted in the Reynolds number range from 3000 to 30,000, volume concentrations of 0.01%, 0.03% and helical Tape inserts of p/d = 5, 10, 15 and 20.

TL;DR: In this paper, the phase-detection probe signals were used to investigate the optimum sampling duration and frequency as well as the data analysis parameters threshold, sub-sampling duration, histogram bin sizes and cut-off effects for high-velocity air-water flows.

TL;DR: In this paper, the effects of laminar nanofluid flow over the microscale backward-facing step (MBFS) and forward-facing steps (MFFS) on the heat transfer characteristics were investigated experimentally.

TL;DR: In this article, the Nusselt number and friction factor of water flow inside a plate heat exchanger with a rough surface are predicted. But the authors did not consider the impact of surface roughness on the heat transfer coefficient.

TL;DR: In this paper, the authors investigated the cavitating flow in transparent VCO nozzles with different length-diameter ratios (L / D ) using diesel and biodiesel, and the energy loss in the occurrence of the hydraulic flip was also analyzed.

TL;DR: In this article, the authors present experimental results about the flow boiling of R1234yf inside a mini microfin tube, which is a Hydro Fluoro Olefin with a GWP.

TL;DR: In this paper, the effect of various parameters on heat transfer was investigated, such as pressure, mass flux, heat flux and tube diameter, and the importance of several dimensionless numbers and the accuracy of five widely applied heat transfer correlations were assessed.

TL;DR: In this article, the effect of pH variation of two nanofluids, CuO and Al 2 O 3, on the efficiency of a new cylindrical solar collector is studied.