scholarly journals Thermal Characterization of Biofluids for Heat Transfer Fluid in Thermal Transport Technologies

2021 ◽  
Vol 89 (1) ◽  
pp. 134-141
Author(s):  
Lukmon Owolabi Afolabi ◽  
Oluwafunke T Afolabi-Owolabi ◽  
Abdulhafid M Elfaghi ◽  
Djamal Hissein Didane ◽  
Mohammed Ghaleb Awadh ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermophysical Properties ◽  
Moringa Oleifera ◽  
Heating Temperature ◽  
Experimental Studies ◽  
Palm Kernel ◽  
Heat Transfer Fluid ◽  
Thermal Constant ◽  
Kernel Oil ◽  
Mango Kernel

Thermal fluids modulate temperature conditions around the thermal collector systems indirectly by circulating the heat transfer fluid throughout the heat exchanger, thereby simulating cooling and heating with thermal condition. This study investigates biofluid from Moringa oleifera kernel, Date kernel, Palm kernel, Coconut kernel and Mango kernel as base fluids for heat transfer fluid application in solar thermal technology. The methodology employed in this study is experimental and the analyzed biofluids results was compared with conventional heat transfer base fluids. Thermal constant analyzer (TPS-2005S), CT-72 Transparent viscometer and Eagle eye SG-500 portable digital hydrometer were used to measure the thermophysical properties, viscosity, and density, of the biofluids respectfully. From the results, the biofluids showed comparative thermophysical properties to conventional base fluids. Moringa oleifera kernel oil and Mango kernel oil has the best quality among the biofluids with thermal conductivity, specific heat, viscosity, and density value was 0.1698Wm/k, 1984.01J/kg.K, 37.12mm2/s, 874.23kg/m3, and 0.2642Wm/k, 763.18J/kg.K, 45.27mm2/s, 914.22kg/m3, respectively. The biofluids was thermally stable after exposure to several heating cycles and heating temperature as no significant degradation was observed in there thermophysical properties. However, there are needs for further experimental studies on clogging and possibility of enhancement of biofluids with organic nanoadditives.

scholarly journals Experimental Investigation on Evacuated Tube Solar Collector Using Biofluid as Heat Transfer Fluid

2021 ◽  
Vol 87 (3) ◽  
pp. 40-50
Author(s):  
Lukmon Owolabi Afolabi ◽  
Oluwafunke Afolabi-Owolabi ◽  
Abdulhafid M Elfaghi ◽  
Djamal Hissein Didane ◽  
Mohammed Ghaleb Awadh ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Solar Collector ◽  
Palm Kernel ◽  
Nano Particles ◽  
Heat Transfer Fluid ◽  
Fluid Temperature ◽  
Water Tank ◽  
Kernel Oil ◽  
Evacuated Tube Solar Collector ◽  
Evacuated Tube

Bio-oil extracted from waste of different plant kernel was used as heat transfer fluid in evacuated tube solar collector. Thermal performance of the biofluids to the enhancement of the evacuated tube solar collector under varying weather conditions and experimental analysis was carried-out. Thermal analysis on the storage water tank temperature, outlet and inlet heat transfer fluid temperature, and heat gains by was studied. In addition, the biofluids thermophysical properties and degradation analysis was conducted and compared with conventional base-fluids. From the results the biofluids caused enhancement of heat gain in the collector receiver by 9.5%, 6.4% and 3.2% for moringa oleifera kernel oil (MOKO), date kernel oil (DKO) and palm kernel oil (PKO), respectively. The storage water tank temperature at night fall was 53, 49, 51 and 47oC, for the MOKO, DKO, PKO and water HTFs, respectively. The biofluids were thermal stable and with no degradation. The biofluids demonstrated potentials as heat transfer fluids in thermal applications but there are needs for more investigations on their enhancement with organically synthesized nano particles to preserve there no corrosive and toxicity nature, and experimental performance on heat exchangers after several heating cycles.

Experimental studies on micro-channel heat sink with different heat transfer fluid

2021 ◽  
Author(s):  
M. P. Dhanishk ◽  
P. Selvakumar ◽  
V. Ashwin ◽  
P. N. ArunKumar
Keyword(s):  
Heat Transfer ◽  
Heat Sink ◽  
Experimental Studies ◽  
Heat Transfer Fluid ◽  
Micro Channel

Call for Nominations – The Nusselt–Reynolds Prize Sponsored by Assembly of World Conferences on Experimental Heat Transfer, Fluid Mechanics, and Thermodynamics

2000 ◽  
Vol 402 ◽  
pp. 382-382
Author(s):  
Nobuhide Kasagi
Keyword(s):  
Heat Transfer ◽  
Fluid Mechanics ◽  
Design Theory ◽  
Experimental Studies ◽  
Heat Transfer Fluid ◽  
World Conference ◽  
Experimental Heat ◽  
Technological Advances ◽  
Visualization Techniques ◽  
Physical Phenomena

The Nusselt–Reynolds Prize has been established by the Assembly of World Conferences to commemorate outstanding contributions by Wilhelm Nusselt and Osborne Reynolds as experimentalists, researchers, educators, and authors. As many as three prizes may be bestowed at every World Conference, one in each of the areas of heat transfer, fluid mechanics, thermodynamics, or any combination of these.The prize will be bestowed for outstanding scientific and engineering contributions and eminent achievements in the fields of heat transfer, fluid mechanics, and thermodynamics through (1) experimental studies and analytical/numerical extension of the measurements, (2) development of experimental techniques, visualization techniques, and/or instrumentation, and/or (3) development of design theory (that needs experimental data) and theory-based experimental correlations. These contributions should yield a deeper insight into physical phenomena involved or should yield significant technological advances. In addition to research, the awardee(s) should have made outstanding contributions to the field through teaching, design, or a combination of such activities. The prize is based on achievement through publications or through the application of the science or art. Nationality, age, sex, and society membership will not be considered when evaluating qualifications of candidates. A candidate must be living at the time of designation as a recipient of the prize.The prize consists of a bronze plaque, and engrossed certificate, and an honorarium. The prize is administered by the Prize Board. The deadline for accepting nominations for the Prize is February 2, 2000. The prize will be awarded at the Fifth World Conference during September 24–28, 2001 in Thessaloniki, Greece where the prize winners will also present plenary lectures on their subjects.Nominators can obtain further information and download the nomination form from a webpage at http://www.thtlab.t.u-tokyo.ac.jp/N-Rprize.html/.

Review of Artificial Bubble Generation Techniques and Their Suitability for Phenomenological Boiling Studies

2020 ◽  
Author(s):  
Navdeep Singh Dhillon
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Experimental Studies ◽  
Solid Surfaces ◽  
Interfacial Phenomena ◽  
Heat Transfer Fluid ◽  
Bubble Generation ◽  
Multiple Bubbles

Abstract The heterogeneous boiling of liquids on hot surfaces, despite its importance, is an extremely complicated and murky phenomenon. It involves the random probabilistic nucleation of multiple bubbles whose growth, interaction, and departure, further, depends on processes involving heat transfer, fluid flow, and interfacial phenomena. This, and the random tumultuous nature of boiling makes experimental studies of the process extremely difficult. For achieving a phenomenological understanding of boiling, several researchers have relied on experiments involving artificially generated bubbles on solid surfaces. In this paper, we evaluate these methods of artificial bubble generation and explore how closely they replicate actual heterogeneous boiling conditions experienced by bubbles. Based on this, we assess the suitability of these methods for conducting phenomenological boiling studies, and identify their potential advantages and drawbacks.

scholarly journals Ground-Coupled Natural Circulating Devices (Thermosiphons): A Review of Modeling, Experimental and Development Studies

Inventions ◽  
2019 ◽  
Vol 4 (1) ◽  
pp. 14
Author(s):  
Messaoud Badache ◽  
Zine Aidoun ◽  
Parham Eslami-Nejad ◽  
Daniela Blessent
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Low Temperatures ◽  
Experimental Studies ◽  
Heat Transfer Fluid ◽  
Fluid Circulation ◽  
Ground Heat Exchangers ◽  
Additional Equipment ◽  
Different Types ◽  
Overall Efficiency

Compared to conventional ground heat exchangers that require a separate pump or othermechanical devices to circulate the heat transfer fluid, ground coupled thermosiphons or naturallycirculating ground heat exchangers do not require additional equipment for fluid circulation in theloop. This might lead to a better overall efficiency and much simpler operation. This paper providesa review of the current published literature on the different types of existing ground coupledthermosiphons for use in applications requiring moderate and low temperatures. Effort has beenfocused on their classification according to type, configurations, major designs, and chronologicalyear of apparition. Important technological findings and characteristics are provided in summarytables. Advances are identified in terms of the latest device developments and innovative conceptsof thermosiphon technology used for the heat transfer to and from the soil. Applications arepresented in a novel, well-defined classification in which major ground coupled thermosiphonapplications are categorized in terms of medium and low temperature technologies. Finally,performance evaluation is meticulously discussed in terms of modeling, simulations, parametric,and experimental studies.

scholarly journals Improved Thermophysical Properties and Energy Efficiency of Aqueous Ionic Liquid/MXene Nanofluid in a Hybrid PV/T Solar System

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1372 ◽  
Author(s):  
Likhan Das ◽  
Khairul Habib ◽  
R. Saidur ◽  
Navid Aslfattahi ◽  
Syed Mohd Yahya ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Ionic Liquid ◽  
Palm Oil ◽  
Thermophysical Properties ◽  
Conductivity Measurement ◽  
Optimum Concentration ◽  
Heat Transfer Fluid ◽  
Solar Pv ◽  
T System

In recent years, solar energy technologies have developed an emerging edge. The incessant research to develop a power source alternative to fossil fuel because of its scarcity and detrimental effects on the environment is the main driving force. In addition, nanofluids have gained immense interest as superior heat transfer fluid in solar technologies for the last decades. In this research, a binary solution of ionic liquid (IL) + water based ionanofluids is formulated successfully with two dimensional MXene (Ti3C2) nano additives at three distinct concentrations of 0.05, 0.10, and 0.20 wt % and the optimum concentration is used to check the performance of a hybrid solar PV/T system. The layered structure of MXene and high absorbance of prepared nanofluids have been perceived by SEM and UV–vis respectively. Rheometer and DSC are used to assess the viscosity and heat capacity respectively while transient hot wire technique is engaged for thermal conductivity measurement. A maximum improvement of 47% in thermal conductivity is observed for 0.20 wt % loading of MXene. Furthermore, the viscosity is found to rise insignificantly with addition of Ti3C2 by different concentrations. Conversely, viscosity decreases substantially as the temperature increases from 20 °C to 60 °C. However, based on their thermophysical properties, 0.20 wt % is found to be the optimum concentration. A comparative analysis in terms of heat transfer performance with three different nanofluids in PV/T system shows that, IL+ water/MXene ionanofluid exhibits highest thermal, electrical, and overall heat transfer efficiency compared to water/alumina, palm oil/MXene, and water alone. Maximum electrical efficiency and thermal efficiency are recorded as 13.95% and 81.15% respectively using IL + water/MXene, besides that, heat transfer coefficients are also noticed to increase by 12.6% and 2% when compared to water/alumina and palm oil/MXene respectively. In conclusion, it can be demonstrated that MXene dispersed ionanofluid might be great a prospect in the field of heat transfer applications since they can augment the heat transfer rate considerably which improves system efficiency.

Experimental Study on the Stability and Thermophysical Properties of Binary Propanol-Water Mixtures Based Phase Change Microencapsule Suspensions

2013 ◽  
Author(s):  
Liang Wang ◽  
Li Liu ◽  
Yifei Wang ◽  
Lei Chai ◽  
Zheng Yang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Phase Change ◽  
Thermophysical Properties ◽  
Heat Transfer Performance ◽  
Heat Storage ◽  
Experimental Result ◽  
Thermal Constant ◽  
Transfer Performance ◽  
Thermal Fluids ◽  
Alcohol Water

Phase change microencapsules are the microsized particles made of phase change materials (paraffin wax ect.) sealed by the thin shell (polymer ect.) via the methods of microencapsulation. During last decade, due to the large amount of melting/solidifying heat, much attention have been paid on their application in environmental control, building, textiles and electronics ect. Also the novel thermal fluids by phase change microencapsules suspending in the traditional thermal fluids have shown their superior heat storage density and convective heat transfer performance, which can behave as heat storage media and heat transfer media simultaneously. However, the density difference between the phase change microencapsules and tranditional unitary fluid would lead to the unstable suspending states which seriously affect the heat storage and heat transfer performance. Binary mixtures such as alcohol-water etc have already played the important roles in the heat transfer equipments. In this paper, binary propanol-water mixtures of various proportion were formulated as the base fluids, and their stabilities were studied. The result shows that binary propanol-water mixtures with the desity of 941kg/m3 showed the best stability and no stratification was found after standing for 48 hours. The morphology and diameter distribution of the microencapsule particles were tested by the scanning electron microscope (SEM) and Malvern Nanosizer respectively, and the result show that the diameter of the particles is in the range of 10–80μm with the average value of 26.4μm. The phase change enthalpy and the effective heat capacity of phase change microencapsule suspensions with the concentration of 10–40wt% were measured by the differencial scanning calorimeter (DSC) and it was found the phase change enthalpy of the phase change microencapsule is 152.8J/g and the undercooling is only 7.3°C. The effect of concentration and temperature on the rheological behavior and viscosities of suspensions were experimentally studied by the TA DHR-G2 rheometer. The result shows that the suspensions behave as Newtonian fluids even when the concentration is as high as 40wt% and the viscosities fit well with Vand model. By the Hot Disk 2500S thermal constant analyzer (Sweden), the thermal conductivities of 0–40wt% suspensions were tested at 20–70°C and the variation was analyzed further. The concentration and expansion of MPCM particles during the phase change period were found to affect the thermal expansion coefficient of the MPCM suspensions obviously. The above experimental result and analyzation of stability and thermophysical properties will provide a complete and important data for the application in heat storage and heat transfer.

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