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Investigations of Heat Transfer with Estimation of Temperature Uncertainty Measurements

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A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "J1: Heat and Mass Transfer".

Deadline for manuscript submissions: closed (14 November 2024) | Viewed by 5517

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Prof. Dr. Magdalena Piasecka

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Faculty of Mechatronics and Mechanical Engineering, Kielce University of Technology, Al. Tysiaclecia Panstwa Polskiego 7, 25-314 Kielce, Poland
Interests: heat transfer; minichannels; minigaps; compact heat exchangers; two-phase flow; heat transfer enhancement; temperature measurement; computational methods for solving inverse heat transfer problems; thermal and production engineering; quality management tools
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Dear Colleagues,

The transfer of large heat fluxes is one of the most significant issues with modern technology. In recent years, the range of applications for heat transfer has broadened considerably, including new systems. Theoretical analyses, experimental measurements, and practical applications have been performed to help us understand heat and mass transfer phenomena. The results of these studies provide us with information about the design of cooling systems for cooling, thermostabilization, and thermoregulation. Moreover, it should be underlined that statistical data on temperature measurements are needed to ensure that heat transfer results based on experiments are reliable.

I invite you to submit an article to the Special Issue of Energies on the subject of “Investigations of heat transfer with estimation of temperature uncertainty measurements”.

Topics of interest include:

Heat and mass transfer problems also with change of phase;
Heat transfer enhancement;
Multiphase flow;
Unsteady flow and instabilities;
Methods for identifying two-phase flow structures;
Computational methods for solving heat and mass transfer problems;
Prediction of correlations between heat transfer and pressure drops;
Practical applications.

Original articles containing experimental research, case studies, theoretical analyses, computational methods, practical applications, or other discussions on heat and mass transfer, as well as temperature uncertainty measurements, are strongly encouraged.

Prof. Dr. Magdalena Piasecka
Guest Editor

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Published Papers (5 papers)

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Research

17 pages, 4168 KiB

Open AccessArticle

Study on the Multiphase Flow Behavior in Jet Pump Drainage and Natural Gas Hydrate Production Wells with Combined Depressurization and Thermal Stimulation Method

by Xiaolin Ping, Jiqun Zhang, Guoqing Han, Junhua Chang and Hongliang Wang

Energies 2024, 17(15), 3842; https://doi.org/10.3390/en17153842 - 4 Aug 2024

Viewed by 876

Abstract

Natural gas hydrate (NGH) trials have been performed successfully with different development methods and gas recovery drainage technologies. Multiphase flow in a wellbore and the drainage of natural gas hydrate are two important parts for its whole extraction process. Additionally, the choice of the drainage method is linked to the development method, making the drainage of NGH more complex. Jet pump drainage is usable for NGH production wells with the combined depressurization and thermal stimulation method. The objective of this study is to shed more light on the multiphase flow behavior in jet pump drainage and NGH production wells and put forward suggestions for adjusting heat injection parameters. The mechanism of jet pump drainage recovery technology for NGH wells was analyzed and its applicability to NGH development by the combined depressurization and thermal stimulation method was demonstrated. In addition, multiphase flow models of tubing and annulus were established, respectively, for the phenomenon of the countercurrent flow of heat exchange in the process of jet pump drainage and gas production, and the corresponding multiphase flow laws were derived. On the basis of these studies, sensitivity analysis and the optimization of thermal stimulation parameters were conducted. It is demonstrated that jet pump drainage gas recovery technology is feasible for the development of onshore NGH with the combined depressurization and thermal stimulation method. The laws of multiphase flow in the tubing and annulus of jet pump drainage and NGH production wells were disclosed in this study. Numerical simulation results show that the temperature and pressure profiles along the wellbore of jet pump drainage and NGH production wells during the drainage recovery process are affected by injection conditions. Increasing injection rate and injection temperature can both improve the effect of heat injection and reduce the hydrate reformation risk in the bottom of the annulus. This study offers a theoretical basis and technical support for production optimization and hydrate prevention and control in the wellbore of jet pump drainage and NGH production wells. Full article

(This article belongs to the Special Issue Investigations of Heat Transfer with Estimation of Temperature Uncertainty Measurements)

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32 pages, 10224 KiB

Open AccessArticle

Economic and Exergy Analysis of TiO₂ + SiO₂ Ethylene-Glycol-Based Hybrid Nanofluid in Plate Heat Exchange System of Solar Installation

by Sylwia Wciślik and Dawid Taler

Energies 2024, 17(13), 3107; https://doi.org/10.3390/en17133107 - 24 Jun 2024

Viewed by 689

Abstract

This paper concerns an economic and exergetic efficiency analysis of a plate heat exchanger placed in a solar installation with TiO₂:SiO₂/DI:EG nanofluid. This device separates the primary circuit—with the solar fluid—and the secondary circuit—in which domestic hot water flows (DHW). The solar fluid is TiO₂:SiO₂ nanofluid with a concentration in the range of 0.5–1.5%vol. and T = 60 °C. Its flow is maintained at a constant level of 3 dm³/min. The heat-receiving medium is domestic water with an initial temperature of 30 °C. This work records a DHW flow of

{\dot{V}}_{D H W, i n}

= 3–6(12) dm³/min. In order to calculate the exergy efficiency of the system, first, the total exergy destruction, the entropy generation number N_s, and the Bejan number Be are determined. Only for a comparable solar fluid flow, DHW

{\dot{V}}_{n f} = {\dot{V}}_{D H W}

3 dm³/min, and concentrations of 0 and 0.5%vol. is there no significant improvement in the exergy efficiency. In other cases, the presence of nanoparticles significantly improves the heat transfer. The TiO₂:SiO₂/DI:EG nanofluid is even a 13 to 26% more effective working fluid than the traditional solar fluid; at Re = 329, the exergy efficiency is

η_{e x e r g y}

= 37.29%, with a nanoparticle concentration of 0% and

η_{e x e r g y}

(1.5%vol.) = 50.56%; with Re = 430,

η_{e x e r g y}

(0%) = 57.03% and

η_{e x e r g y}

(1.5%) = 65.9%. Full article

(This article belongs to the Special Issue Investigations of Heat Transfer with Estimation of Temperature Uncertainty Measurements)

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18 pages, 1320 KiB

Open AccessArticle

CFD Investigations on Heavy Liquid Metal Alternative Target Design for the SPS Beam Dump Facility

by Marco Calviani, Carlo Carrelli, Antonio Cervone, Pietro Cioli Puviani, Ivan Di Piazza, Luigi Salvatore Esposito, Sandro Manservisi, Giuseppe Mazzola, Luca Tricarico and Rui Franqueira Ximenes

Energies 2024, 17(12), 2952; https://doi.org/10.3390/en17122952 - 15 Jun 2024

Viewed by 591

Abstract

This study introduces numerical advancements in an alternative design for the Super Proton Synchrotron (SPS) Beam Dump Facility (BDF) at the European Laboratory for Particle Physics (CERN). The design envisions a high-power operation target made of flowing liquid lead. The proposed BDF is a versatile facility for both beam-dump-like and fixed-target experiments. The target behavior is studied, assuming a proton beam with a momentum of 400 GeV/c, a pulse frequency of 1/7.2 Hz, and an average beam power of 355 kW. Using various Computational Fluid Dynamics (CFD) codes, we evaluate the behavior of liquid lead and predict the thermal stress on the target vessel induced by the pulsed heat source generated by the charged particle beam. The comparison increases the reliability of the results, investigating the dependencies on the CFD modeling approach. The beam is a volumetric heat source with data from the beam-lead interaction simulations provided by the European Laboratory for Particle Physics and obtained with a Monte Carlo code. Velocity field and stress profiles can enhance the design of the lead loop and verify its viability and safety when operated with a liquid metal target. Full article

(This article belongs to the Special Issue Investigations of Heat Transfer with Estimation of Temperature Uncertainty Measurements)

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33 pages, 5099 KiB

Open AccessFeature PaperArticle

Investigations of Flow Boiling in Mini-Channels: Heat Transfer Calculations with Temperature Uncertainty Analyses

by Magdalena Piasecka, Beata Maciejewska, Dariusz Michalski, Norbert Dadas and Artur Piasecki

Energies 2024, 17(4), 791; https://doi.org/10.3390/en17040791 - 6 Feb 2024

Cited by 3 | Viewed by 1339

Abstract

The article aims to explore boiling heat transfer in mini-channels with a rectangular cross-section using various fluids (HFE-649, HFE-7000, HFE-7100, and HFE-7200). Temperature measurements were conducted using infrared thermography for the heated wall and K-type thermocouples for the working fluid. The 2D mathematical model for heat transfer in the test section was proposed. Local heat transfer coefficients between the heated wall and the working fluid were determined from the Robin condition. The problem was solved by means of the finite element method (FEM) with Trefftz functions. The values of the heat transfer coefficient that were obtained were compared with the results calculated from Newton’s law of cooling. The average relative differences between the obtained results did not exceed 4%. The study included uncertainty analyses for temperature measurements with K- and T-type thermocouples. Expanded uncertainties were calculated using the uncertainty propagation and Monte Carlo methods. Precisely determining the uncertainties in contact temperature measurements is crucial to ensure accurate temperature data for subsequent heat transfer calculations. The results of the heat transfer investigations were compared in terms of fluid temperature, heat transfer coefficients, and boiling curves. HFE-7200 consistently exhibited the highest fluid temperature and temperature differences at boiling incipience, while HFE-7000 demonstrated the highest heat transfer coefficients. HFE-649 showed the lowest heat transfer coefficients. The boiling curves exhibited a typical shape, with a notable occurrence of ‘nucleation hysteresis phenomena’. Upon the analysis of two-phase flow patterns, bubbly and bubbly-slug structures were observed. Full article

(This article belongs to the Special Issue Investigations of Heat Transfer with Estimation of Temperature Uncertainty Measurements)

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19 pages, 4623 KiB

Open AccessArticle

Pool Boiling of Ethanol on Copper Surfaces with Rectangular Microchannels

by Robert Kaniowski, Robert Pastuszko, Egidijus Dragašius and Saulius Baskutis

Energies 2023, 16(23), 7883; https://doi.org/10.3390/en16237883 - 2 Dec 2023

Cited by 2 | Viewed by 1318

Abstract

In this paper, pool boiling of ethanol at atmospheric pressure was analyzed. The enhanced surfaces were made of copper, on which grooves with a depth ranging from 0.2 to 0.5 mm were milled in parallel. The widths of the microchannels and the distances between them were 0.2 mm, 0.3 mm and 0.4 mm, respectively. The highest heat transfer coefficient, 90.3 kW/m²K, was obtained for the surface with a microchannel depth of 0.5 mm and a width of 0.2 mm. The maximum heat flux was 1035 kW/m². For the analyzed surfaces, the maximum heat flux increase of two and a half times was obtained, while the heat transfer coefficient increased three-fold in relation to the smooth surface. In the given range of heat flux 21.2–1035 kW/m², the impact of geometric parameters on the heat transfer process was presented. The diameters of the departing bubbles were determined experimentally with the use of a high-speed camera. A simplified model was proposed to determine the diameter of the departure bubble for the studied surfaces. Full article

(This article belongs to the Special Issue Investigations of Heat Transfer with Estimation of Temperature Uncertainty Measurements)

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