Journal of Thermal Analysis and Calorimetry最新文献

{"title":"Thermal analysis of various chromium compounds using TGA and DSC methods: a comparative investigation","authors":"Seyed Ali Akbar Sajadi, Zeynab Khorablou, Alireza Nazari Alavi","doi":"10.1007/s10973-024-13401-3","DOIUrl":"https://doi.org/10.1007/s10973-024-13401-3","url":null,"abstract":"<p>This study explored thermal behavior of four kinds of chromium compounds such as CrO₃, K₂Cr₂O₇, K₂CrO₄, and Cr₂O₃ using thermogravimetry (TG) and differential scanning calorimetry (DSC) method under the oxygen (O₂) and nitrogen (N₂) gas atmosphere at varying temperatures (25 to 1600 ℃). A diverse of chromium compounds were carefully evaluated for the first time through this method, and the present work provides new, comprehensive and valuable information regarding the mentioned compounds. XRD technique and elemental analysis were applied in order to recognize the products at diverse decomposition stages. The obtained products were then investigated via a SEM electron microscope. Also, the form and the size of crystals were explored. Interestingly, the results obtained from both TG and DSC experiments in O₂ and N₂ atmospheres were identical. The thermodynamic data obtained from DSC experiments are reported in this work. Along with ∆H for each peak. It was shown that the decomposition product of K₂Cr₂O₇ was also a mixture of Cr₂O₃ and K₂CrO₄ at 1400 °C.</p><p>This study explored thermal behavior of four kinds of chromium compounds such as CrO₃, K₂Cr₂O₇, K₂CrO₄, and Cr₂O₃ using thermogravimetry (TG) and differential scanning calorimetry (DSC) method under the oxygen (O₂) and nitrogen (N₂) gas atmosphere at varying temperatures (25 to 1600 ℃). A diverse of chromium compounds were carefully evaluated for the first time through this method, and the present work provides new, comprehensive and valuable information regarding the mentioned compounds. XRD technique and elemental analysis were applied in order to recognize the products at diverse decomposition stages. The obtained products were then investigated via a SEM electron microscope. Also, the form and the size of crystals were explored. Interestingly, the results obtained from both TG and DSC experiments in O₂ and N₂ atmospheres were identical. The thermodynamic data obtained from DSC experiments are reported in this work. Along with ∆H for each peak. It was shown that the decomposition product of K₂Cr₂O₇ was also a mixture of Cr₂O₃ and K₂CrO₄ at 1400 °C.</p>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141870954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficacy of pulsed Nd:YAG laser on forearm skin temperature and electrophysiology in normal subjects: a case-control study","authors":"Mohamed Salaheldien Alayat, Nahla Ahmad Almatrafi, Ehab Mohamed Abd El-Kafy, Reem Mohammed Basuodan, Halah Yaser Gari","doi":"10.1007/s10973-024-13486-w","DOIUrl":"https://doi.org/10.1007/s10973-024-13486-w","url":null,"abstract":"<p>To investigate the effect of a pulsed Nd:YAG laser on the forearm local skin temperature (LST) and electrophysiology in healthy adults. A total of 30 healthy subjects with a mean age of 21 ± 0.74 years, mass of 63 ± 9.97 kg, and height of 163.7 ± 6.24 cm participated in this study. The anterior surface of the left non-dominant forearm was scanned with a pulsed Nd:YAG laser at 20 Jcm⁻² for a total of 2000 J in 15 min. The right forearm was considered as the control and was scanned with a placebo laser for the same time as the active laser. Forearm minimal, average, and maximum LST were measured using a thermographic camera. Electrophysiological assessment of the median nerve [distal motor latency (DML), motor nerve conduction velocity (MNCV), and sensory nerve conduction velocity (SNCV)] was performed on both forearms before and after the application of the pulsed Nd:YAG laser. Paired and unpaired t tests were used to compare within and between groups, respectively. The level of significance was set at <i>p</i> &gt; 0.05. There were significant increases in the minimum, average, and maximum LST, as well as the MNCV and SNCV with a significant decrease in DML after laser application compared to the control. The average increase in LST and nerve conduction velocity post-treatment was 275.55 K and 4.8 ms⁻¹, respectively. The application of a pulsed Nd:YAG laser significantly increased the forearm LST, MNCV, and SNCV and significantly decreased the DML in healthy subjects. The average increase in the LST was 275.55 K with an average increase of 5 ms⁻¹ in the motor and 4 ms⁻¹ in the sensory NCVS.</p>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141870714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Direct measurement of magnetocaloric effect (MCE) in frustrated Gd-based molecular complexes","authors":"Yu Zhang, Tetsuya Nomoto, Satoshi Yamashita, Hiroki Akutsu, Nobuto Yoshinari, Takumi Konno, Yasuhiro Nakazawa","doi":"10.1007/s10973-024-13344-9","DOIUrl":"https://doi.org/10.1007/s10973-024-13344-9","url":null,"abstract":"<p>Generation of low temperatures below 1 K has been required for applications and fundamental research, given this, development of new materials utilized for demagnetization cooling has extensively been performed in recent years. Here, we studied two polynuclear Gd³⁺-based molecular compounds of Gd_0.33[Gd₄(OH)₄(OAc)₃][Rh₄Zn₄(L-cys)₁₂]·32H₂O (<b>1</b>_<b>Gd</b>) and Gd_0.33[Gd₄(OH)₄(OAc)₃][Ir₄Zn₄(L-cys)₁₂]·28H₂O (<b>2</b>_<b>Gd</b>) (L-cys = L-cysteinate) which show paramagnetic even at low temperatures due to their frustrated arrangement of Gd³⁺ ions. We discuss the magnitude of the magnetocaloric effect (MCE) in them inferred from the isothermal magnetic entropy change (<span>({Delta S}_{text{M}})</span>) from isothermal magnetization data. The − <span>(Delta S_{{text{M}}}^{{{text{max}}}})</span> of <b>1</b>_<b>Gd</b> and <b>2</b>_<b>Gd</b> are 15.15 J kg⁻¹ K⁻¹ and 17.49 J kg⁻¹ K⁻¹ occur at 2.0 K under an applied field from 0 to 7 T, respectively. We also discussed the results of heat capacity measurement under magnetic fields to confirm the validity of the entropy change for <b>1</b>_<b>Gd</b>. Furthermore, with an aim of detecting their MCE directly, we have developed a new non-magnetic and metal-free magnetocaloric measurement cell. The adiabatic temperature change (<span>(Delta T_{{{text{ad}}}})</span>) occurs in a small amount of sample on an order of 10²-microgram with the application and removal of various magnitude magnetic fields starting from several initial temperatures were detected directly, to evaluate the potential of them to be a refrigerant for an adiabatic demagnetization refrigerator. The instrumental design for direct measurements of MCE is described along with the construction details.</p>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141870715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Monitoring chemical reactions following the addition of TiO2 nanoparticles in white Portland cement pastes","authors":"Marcel Hark Maciel, Sérgio Roberto Andrade Dantas, Roberto Cesar de Oliveira Romano, Rafael Giuliano Pileggi","doi":"10.1007/s10973-024-13440-w","DOIUrl":"https://doi.org/10.1007/s10973-024-13440-w","url":null,"abstract":"<p>Nanoparticles of titanium dioxide (NPs-TiO₂) are used in several industries, with common applications due to their surface photocatalytic effect. An alternative use is the TiO₂ addition to partially replace white Portland cement (WPC) to maintain the reflectivity surface over time. However, although it is known that the TiO₂ addition influences the reaction kinetics of Portland cement, there are still literature controversies about how this material’s physical, chemical, and mineralogical characteristics affect this dynamic. Therefore, this paper aims to monitor the chemical reaction after adding NPs-TiO₂ in WPC suspensions and discuss its effect on the hydration process concerning TiO₂ characteristics and the addition content. For this purpose, two TiO₂ samples with distinct mineralogical characteristics—pure anatase (TiPC105) and a combination of rutile and anatase (TiP25)—were used. The evolution of hydration kinetics was analyzed by calorimetry, while XRD analyzed the suspension’s mineralogy over time, and the hydrated compounds were quantified by thermogravimetry. It was found that the physical characteristics of the particles are more important for the suspension’s reaction kinetics than their mineralogical characteristics. However, in early hydration, adding finer NPs-TiO₂ did not lead to higher heat flow rates due to their tendency to agglomerate, reducing their effective surface area and consequently the area available for the precipitation of new hydrates. After a certain period, however, the trend usually found in literature prevails, with finer particles leading to higher reactivity.</p>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141870712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improving electric vehicle battery cooling efficiency with nanofluid and vibration integration: a novel thermal management approach","authors":"Suvanjan Bhattacharyya, Tapasvi Bhatt, Abdel El Abed, Rachid Bennacer","doi":"10.1007/s10973-024-13413-z","DOIUrl":"https://doi.org/10.1007/s10973-024-13413-z","url":null,"abstract":"<p>The cooling system of an electric vehicle can be affected in various ways by vibrations, potentially impacting its performance and reliability. This encompasses damage to the components, potential leaks, noise, and discomfort, which may impact the performance. The impact of vibrations on electric vehicle cooling systems utilizing nanofluids as their primary working fluids remains insufficiently explored. Ongoing research aims to elucidate the specific influence of vibrations on these cooling systems implemented in such vehicles. The study of vibrations with amplitudes of up to 5 mm and frequencies of up to 25 Hz has been conducted. In the numerical model, a 2% volume concentration Al₂O₃ solution was utilized as the working fluid, with water serving as the base fluid, and Reynolds numbers ranging from 10,000 to 20,000 in the turbulent regime. The present study is focused on performing exergy and entropy analysis utilizing the second law. On inducing vibration onto the system, the Nusselt number rises to a maximum of 170% compared to the static tube. Entropy generation increases with increasing intensity of vibration. A similar trend is observed for second law efficiency which reaches a maximum of 60.81% at 5 mm amplitude and 25 Hz frequency at 20,000 Reynolds number. But with increasing intensity of vibration, dimensionless number of irreversibility (<span>(phi)</span>) shows a negative trend with a minimum of 0.715 at 25 Hz frequency and 5 mm amplitude of vibration. Introducing controlled vibrations can significantly enhance system availability and efficiency, leading to considerable improvements in energy usage and cost-effectiveness.</p>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141870953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"4E analysis of a new multi-generation geothermal system based on Allam cycle for providing energy demand of a sample residential building","authors":"Marziye Norani, Mahdi Deymi-Dashtebayaz, Andrey Nikitin","doi":"10.1007/s10973-024-13451-7","DOIUrl":"https://doi.org/10.1007/s10973-024-13451-7","url":null,"abstract":"<p>The increasing energy demand, the reduction of non-renewable resources, and the increase in environmental damage factors have drawn attention to energy supply through multi-generation systems. This study proposes a multi-generation system based on the Allam cycle, integrated with geothermal energy, with the aim of minimizing natural gas fuel consumption. This system includes the main sub-systems: an electrolyzer unit, a reverse osmosis unit, an organic Rankine cycle, a hydrogen engine, an absorption chiller, and a compression chiller. The proposed multi-generation system provides the hourly demands of freshwater, cooling, heating and electricity of a residential building located in the city of St. Petersburg (in Russia). For the purpose of feasibility, the system is studied from the thermodynamic, environmental, and economic points of view. The results of the thermodynamic analysis showed that the system has maximum energy and exergy efficiency of 29.759 and 25.879% respectively. The use of geothermal energy reduced CO₂ emissions to a maximum of 1895043 gr. Calculation of the NPV index for interest rates of 15 to 30% showed that this system will be profitable in the twelfth year at most.</p>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141870709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Irreversibility analysis of Jeffrey fluid flow in a sloping channel with Hall current, thermal radiation, and inclined magnetic field effects","authors":"Ravi Mahla, K. Kaladhar","doi":"10.1007/s10973-024-13335-w","DOIUrl":"https://doi.org/10.1007/s10973-024-13335-w","url":null,"abstract":"<p>In this paper, the entropy generation of natural convection Jeffrey fluid flow through an inclined porous channel is investigated by taking into account the impact of angled magnetic field, Soret parameter, thermal radiation, and Hall current. On the basis of simplified assumptions, the governing equations are transformed into dimensionless equations by using suitable transformations, and the spectral quasi-linearization method (SQLM) is used for the numerical solution. Graphs are utilized to address the effects of new thermophysical parameters. The calculations reveal that increasing the Soret parameter, inclination angle, Hall parameter, magnetic parameter, and Jeffrey fluid parameter induces an increase in entropy generation. Conversely, it decreases as the radiation parameter and channel angle of inclination increase.</p>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141870710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of the formation of epoxy-imidazole adducts and the kinetic triplets during thermal curing of a biobased and petrochemical epoxy with anhydride","authors":"Siva Kaylasa Sundari Saravanamuthu, Arunjunai Raj Mahendran, Günter Wuzella, Stephanie Weiss, Elisabeth Schöffmann","doi":"10.1007/s10973-024-13415-x","DOIUrl":"https://doi.org/10.1007/s10973-024-13415-x","url":null,"abstract":"<p>The development of new advanced materials based on biobased feedstock is required to achieve more sustainable growth while addressing environmental concerns. The substitution of bisphenol-A-based epoxy (DGEBA), a conventional epoxy with bio epoxy resin, epoxidized linseed oil (ELSO), an anhydride-based hardener and mass percent changes in 2-Ethyl imidazole (2-EI), a catalyst were all studied and compared. The DGEBA and ELSO have molecular weights of 362 and 1166 g mol⁻¹, respectively. In the present investigation, two predictions were made: (1) the generation of the epoxy imidazole adduct was followed by multivariate data analysis and (2) the kinetic triplet was estimated using Isoconversional kinetic analysis techniques and compensation effect. By using Real-time FTIR measurement, the formation of either pyrrole or pyridine type intermediate when the accelerator reacts with epoxy (in the absence of hardener) is examined at different temperatures. Differential scanning calorimetry (DSC) detects an effective change in curing in an epoxy-hardener-accelerator combination. Model free and model fitting approaches are used to calculate the kinetic triplets (apparent activation energy for curing-<i>E</i>_a; reaction model-<span>(fleft( alpha right))</span>; and pre-exponential factor-<i>A</i>). Both epoxy resin shows nearly similar <i>E</i>_a value (60 kJ mol⁻¹) but the low <i>E</i>_a in the initial stage for bioepoxy indicate low reactivity. The approach of kinetic triplet prediction, which represents the whole understanding of the reaction, will be relevant for selecting acceptable strategies for the research of curing reactions in epoxy resins. The DSC and kinetic findings of the petroleum-based bisphenol-A epoxy and the bio epoxy composite point to the possibility of replacing bio epoxy in standard resins.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141870707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigations of organic Rankine cycle with various working fluids on geothermal energy for development of distributed generation in Indonesia","authors":"Chih-Hung Lin, Ilham Septyan","doi":"10.1007/s10973-024-13460-6","DOIUrl":"https://doi.org/10.1007/s10973-024-13460-6","url":null,"abstract":"<p>In this study, organic Rankine cycle (ORC) combined with geothermal energy applied for distributed generation (DG) was developed to resolve the problem in Indonesia, especially for remote areas. High investment cost for building traditional power plant in remote areas is a big problem. To increase the utilization of renewable energies, geothermal energy is a great heat source and able to be chosen for resolving energy shortage in Indonesia, in which the useful range of heat source temperature for ORC is between 110 and 180 °C on predictions in this work. The potential energy calculated in Mataloko-02, East Nusa Tenggara, Indonesia, for geothermal was 11,795.57 kW. The predictions of net power generation, net thermal efficiency and exergy were carried out with various heat source temperatures with different working fluids, which were R245fa, R1233zde, R1224ydz, Novec649, R1336mzzz, R1234zez, R141b and Butane. The result showed that R141b has a good performance with the highest net thermal efficiency and exergy. The highest net power generation achieved by using Butane. According to environmental consideration, R141b had high values of Global Warming Potential (GWP) and Ozone Depletion Potential (ODP) compared with other working fluids selected. Based on predictions, R1233zde and R1224ydz presented as potential working fluids to replace the R141b with the best performance in ORC system. In addition, there is an idea proposed to combined ORC and DG to resolve the problem facing of sustainability electricity development and decrease the high investment cost on grid power supply and power losses for the remote areas.</p>","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141870884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of gyrotactic motile microorganisms in powell-eyring nanofluid with non-fourier and non-fick’s theories","authors":"Usman Ali, Muhammad Irfan","doi":"10.1007/s10973-024-13402-2","DOIUrl":"https://doi.org/10.1007/s10973-024-13402-2","url":null,"abstract":"<p>Some of the fluids having non-Newtonian properties are polymers, molten plastic, pastes, nutritional diets, and fuels. Polymers like molten plastics are used in injection molding to make plastic products, pastes such as toothpaste and shampoo are easy to distribute because of their shear thinning behavior (it maintains its shape unless some force is exerted), nutritional diets such as cheese, cream, and yogurt allow easy packaging and spreading. Non-Newtonian fluids enhance the efficiency of oil recovery operations. Also, it is utilized as drilling mud to handle the pressure, filling gaps, and liquefy the drill bits during drilling processes. The motivation for using the three-dimensional magnetized Powell–Eyring nanofluidic model is to obtain the improved performance of heat transfer that includes advanced cooling systems in electronics and drug targeting in biomedical applications. The rheological demeanor in three dimensions enables for more meticulous predictions of flow manner and pressure drop, essential for engineering designs. With the help of magnetic field, the alliance of nanoparticles can be potentially controlled, further improving thermal conductivity and heat transfer rates. The novelty of this study includes Forchheimer heating law, mixed convection, thermal radiation, non-uniform heat source/sink, and Arrhenius activation energy. Further, the Cattaneo–Christov heat and mass flux (CCHFM) model delivers a more precise description of energy and mass transmission in viscoelastic flow regimes by containing a finite thermal relaxation time. By acquiring non-Fourier heat conduction effects and transient heat transfer phenomena, this model offers unique insights into the behavior of complex fluids and enhances our concept of heat and mass transfer processes in viscoelastic materials. In bioconvection, the motile microorganisms reveal a swimming pattern, where individual cells actively drive themselves through the fluid using cilia and flagella. The overall motion of such microorganisms generates fluid flows, which can manifest as vortices, jets, or other fluid structures. The role of gyrotactic bacteria in bioconvection provides foresight into microbial ecology, and biotechnological applications such as biofuel production, and wastewater treatment. These features of the designed model make it differ from the existing studies. The related nonlinear flow model is altered into a system of coupled ordinary differential equations using suitable transformations. Numerical integration scheme named shooting method with the Runge–Kutta fourth–fifth-order algorithm is applied. The influence of the pertinent parameters upon fluid velocity, temperature, concentration, and bioconvection is observed. Furthermore, friction factor, Nusselt number, and transport rate for motile microbe values are shown for a key parameter. The current results are compared with numerical solutions and found good agreement. A higher thermo-Biot number and radiation para","PeriodicalId":678,"journal":{"name":"Journal of Thermal Analysis and Calorimetry","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141870958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}