Prof. K.R. Ajao

@unilorin.edu.ng

Professor, Faculty of Engineering and Technology
University of Ilorin, Nigeria

Prof. K.R. Ajao


                        Download Compact PDF  
https://researchid.co/ajaomech
Kajogbola Rasaq Ajao is a Professor of Mechanical Engineering with specialization in Energy at the University of Ilorin, Nigeria. My research interest covers Renewable Energy Systems, Energy Modeling, Energy Efficiency and Reverse Engineering.

EDUCATION

PhD, Mechanical Engineering

RESEARCH, TEACHING, or OTHER INTERESTS

Mechanical Engineering, Renewable Energy, Sustainability and the Environment
17

Scopus Publications

739

Scholar Citations

15

Scholar h-index

19

Scholar i10-index

Scopus Publications

  • Combustion characteristics of Torrefied corncob and African birch wood residues at higher heating rate
    H.A. Ajimotokan, N.S. Saidu, M.A. Aladodo, K.O. Oladosu, O.D. Samuel, et al.
    Scientific African, 2025
  • Biomass as Feedstocks for Solid Fuel Production: Advances in Sources, Conversion Techniques and Densification Methods
    Nigerian Journal of Technological Development, 2025
  • Wind Resource of Ilorin City for Vortex-Induced Wind Turbine Power Generation and Off-grid Electrification
    Nigerian Journal of Technological Development, 2023
  • Performance analysis and sensitivity of system parameters on the performance of trilateral-cycle power generator systems
    H. A. Ajimotokan, K. R. Ajao, A. B. Rabiu, T. Yahaya, A. Nasir, et al.
    Australian Journal of Mechanical Engineering, 2023
    Though the trilateral cycle (TLC) is a promising heat recovery-to-power cycle, its application has not been widely accepted or commercialised due to some thermodynamic feasibility concerns. This study examined the performance analysis and sensitivity of the system parameters on the thermodynamic performance of the TLC power generator systems for waste heat recovery-to-power generation. Thermodynamic models of the simple, recuperative, reheat and regenerative TLCs were established. Performance analysis and sensitivity of the system parameters on the cycles’ performance were conducted at the expander inlet temperature of 453 to 473 K, expander pressure of 2 to 3 MPa and expander isentropic efficiency of 50% to 100%. The expander inlet temperatures, pressures, and its isentropic efficiencies have significant effects on the thermodynamic efficiencies and net work output of the cycles. At 473 K cycle high temperature, the thermal efficiencies of the cycles increase from 20.13% to 21.97%, 23.29% to 23.91%, 20.62% to 22.07% and 20.66% to 22.9% for the simple, recuperative, reheat and regenerative TLCs, respectively. Their corresponding net power outputs varied from 131.6 to 134.1 kW, 145.9 to 152.2 kW, 113.8 to 124.1 kW and 124.9 to 130.5 kW, respectively. The cycles’ thermodynamic performance increased with an increase in expander inlet temperature, expander pressure and expander isentropic efficiencies.
  • Design and Construction of a Low-Cost-High-Accessibility 3D Printing Machine for Producing Plastic Components
    Kajogbola R. Ajao, Segun E. Ibitoye, Adedire D. Adesiji, Esther T. Akinlabi
    Journal of Composites Science, 2022
    The additive manufacturing process creates objects directly by stacking layers of material on each other until the required product is obtained. The application of additive manufacturing technology for teaching and research purposes is still limited and unpopular in developing countries, due to costs and lack of accessibility. In this study, an extruding-based 3D printing additive manufacturing technology was employed to design and construct a low-cost-high-accessibility 3D printing machine to manufacture plastic objects. The machine was designed using SolidWorks 2020 version with a 10 × 10 × 10 cm3 build volume. The fabrication was carried out using locally available materials, such as PVC pipes for the frame, plywood for the bed, and Zinc Oxide plaster for the bed surface. Repetier firmware was the operating environment for devices running on the computer operating system. Cura was used as the slicing software. The fabricated machine was tested, and the printer produced 3D components with desired structural dimensions. The fabricated 3D printer was used to manufacture some plastic objects using PLA filament. The recommended distance between the nozzle tip and the bed is 0.1 mm. The constructed 3D printer is affordable and accessible, especially in developing nations where 3D printing applications are limited and unpopular.
  • Dataset on the evaluation of chemical and mechanical properties of steel rods from local steel plants and collapsed building sites
    A.A. Adeleke, J.K. Odusote, P.P. Ikubanni, O.A. Lasode, O.O. Agboola, et al.
    Data in Brief, 2018
  • Resource assessment and feasibility study for the generation of hydrokinetic power in the tailwaters of selected hydropower stations in Nigeria
    Laniyi L. Ladokun, Bolaji F. Sule, Kajogbola R. Ajao, Adeniyi G. Adeogun
    Water Science, 2018
  • Mechanical properties improvement evaluation of medium carbon steels quenched in different media
    Peter Pelumi Ikubanni, Adeolu Adesoji Adediran, Adekunle Akanni Adeleke, Kajogbola Rasaq Ajao, Olayinka Oluwole Agboola
    International Journal of Engineering Research in Africa, 2017
    The effect of quenching on the mechanical properties of medium carbon steels using coconut (CW) water, pap water (PW) and spent engine oil (SPE) which have been largely considered as wastes was investigated. All specimens were normalized at a temperature of 840 in order to remove residual stresses induced during machining operations. Various specimens were heated to ranges of 730-790 and soaked for the range of 30-60 minutes respectively. Brinnel hardness tester was used to obtain the hardness values while Testometric M500-50AT model machine was used for the tensile test of the specimens. The highest hardness value (609.97 BHN) was obtained from the specimen heated to 790 quenched in pap water as compared with 166.4 BHN for the normalized as-received sample. The yield (YS) and ultimate tensile (UTS) strengths of the quenched specimens were better than the normalized as-received sample. SPE-quenched samples yielded the highest YS and UTS combined. The hardness value increased while YS and UTS decreased with soaking time for different temperatures. The highest hardness value for the specimens was obtained from coconut and pap water. Rather than been considered as wastes, coconut water, pap water and spent engine oil can improve the mechanical properties of medium carbon steel when used as quenching media.
  • Industrial noise level study in a wheat processing factory in Ilorin, Nigeria
    I. Ibrahim, K.R. Ajao, S.A. Aremu
    International Journal of Applied Mechanics and Engineering, 2016
    An industrial process such as wheat processing generates significant noise which can cause adverse effects on workers and the general public. This study assessed the noise level at a wheat processing mill in Ilorin, Nigeria. A portable digital sound level meter HD600 manufactured by Extech Inc., USA was used to determine the noise level around various machines, sections and offices in the factory at pre-determined distances. Subjective assessment was also mode using a World Health Organization (WHO) standard questionnaire to obtain information regarding noise ratings, effect of noise on personnel and noise preventive measures. The result of the study shows that the highest noise of <i>99.4</i> dBA was recorded at a pressure blower when compared to other machines. WHO Class-4 hearing protector is recommended for workers on the shop floor and room acoustics should be upgraded to absorb some sounds transmitted to offices.
  • Determination of the optimal tilt angle for solar photovoltaic panel in Ilorin, Nigeria
    K. R. Ajao, R. M. Ambali, M. O. Mahmoud, and
    Journal of Engineering Science and Technology Review, 2013
    The optimal tilt angle of solar photovoltaic panel in Ilorin, Nigeria was determined. The solar panel was first mounted at 0o to the horizontal and after ten minutes, the voltage and current generated with the corresponding atmospheric temperature were recorded. The same procedure was repeated for 2o to 30o at a succession of 2o at ten minutes time interval over the entire measurement period. The result obtained shows that the average optimal tilt angle at which a solar panel will be mounted for maximum power performance at fixed position in Ilorin is 22o. This optimum angle of tilt of the solar panel and the orientation are dependent on the month of the year and the location of the site of study.
  • Effect of climate change on outside air design temperature for air conditioning cooling load calculations for ikeja and ilorin, nigeria
    J.A. Olorunmaiye, K.R. Ajao, I.S. Omolehin
    Energy Engineering Journal of the Association of Energy Engineering, 2012
  • Compact fluorescent lamps and electricity consumption trend in residential buildings in Ilorin, Nigeria
    Bolaji F. Sule, Kajogbola R. Ajao, Habeeb A. Ajimotokan, Mohammed K. Garba
    International Journal of Energy Sector Management, 2011
  • A survey of use of electric lamps and energy consumption in residential buildings in selected estates in ilorin, nigeria
    B.F. Sule, K.R. Ajao, H.A. Ajimotokan
    Energy Engineering Journal of the Association of Energy Engineering, 2011
  • Air-conditioning cooling load and petrol - Ethanol mixtures in engines impact on global climate change
    J. A. Olorunmaiye, D. O. Ariyo, A. D. Ogunshola, K. R. Ajao
    International Journal of Fluid Mechanics Research, 2011
  • Development and power performance test of a small three-blade orizontal-axis wind turbine
    K. R. Ajao, I. K. Adegun
    Heat Transfer Research, 2009
  • Electric energy supply in Nigeria, decentralized energy approach
    K. R. Ajao, H. A. Ajimotokan, O. T. Popoola, H. F. Akande
    Cogeneration and Distributed Generation Journal, 2009
  • Interface for modeling the power output of a small wind turbine
    Indian Journal of Science and Technology, 2009

RECENT SCHOLAR PUBLICATIONS

  • Biomass as Feedstocks for Solid Fuel Production: Advances in Sources, Conversion Techniques and Densification Methods
    NS Saidu, HA Ajimotokan, KR Ajao
    Nigerian Journal of Technological Development 22 (2), 43-63 , 2025
    2025
    Citations: 1
  • Combustion characteristics of Torrefied corncob and African birch wood residues at higher heating rate
    HA Ajimotokan, NS Saidu, MA Aladodo, KO Oladosu, OD Samuel, ...
    Scientific African 27, e02494 , 2025
    2025
    Citations: 2
  • Wind Resource of Ilorin City for Vortex-Induced Wind Turbine Power Generation and Off-grid Electrification
    T Yahaya, HA Ajimotokan, JA Adebisi, II Ahmed, TK Ajiboye, ...
    Nigerian Journal of Technological Development 20 (3) , 2023
    2023
    Citations: 1
  • Performance analysis and sensitivity of system parameters on the performance of trilateral-cycle power generator systems
    HA Ajimotokan, KR Ajao, AB Rabiu, T Yahaya, A Nasir, IK Adegun, ...
    Australian Journal of Mechanical Engineering 21 (1), 133-143 , 2023
    2023
    Citations: 2
  • Feasibility of Large-Scale Combined-Cycle Hydroelectric Power Generation at Shiroro Hydroelectric Power Station, Nigeria.
    KR Ajao, LL Ladokun, AA Ogunmokun, AA Chindo, AI Raji
    Journal of Applied Sciences & Environmental Management 26 (4) , 2022
    2022
    Citations: 4
  • Energy security and Nigeria’s sustainable development: SDG 2030 (7)
    KR Ajao, AG Adeogun, HA Ajimotokan, MA Shuaib
    Journal of Energy Research and Reviews 8 (1), 51-60 , 2021
    2021
    Citations: 6
  • Mechanical Properties of Hot Rolled Ribbed and Plain Steel Rods.
    MA Shuaib, KR Ajao, KO Oladosu
    Journal of Applied Sciences & Environmental Management 25 (5) , 2021
    2021
  • Mechanical Properties of Hot Rolled Ribbed and Plain Steel Rods
    KR AJAO, KO OLADOSU
    University of Port Harcourt , 2021
    2021
  • Optimization of photovoltaic-wind hybrid system for electrifying University of Ilorin E-library
    OT Popoola, AB Rabiu, HK Ibrahim, KR Ajao, JT Bamigboye, IT Idakwoji
    Adeleke Univ. J. Eng. Technol. 4 (1), 55-66 , 2021
    2021
    Citations: 4
  • Engineering education and sustainable development in Nigeria
    HA Ajimotokan, KR Ajao, KA Adebiyi, A Dainkeh, AA Oloyede
    Department of Civil Engineering, University of Ilorin , 2019
    2019
    Citations: 10
  • Dataset on the evaluation of chemical and mechanical properties of steel rods from local steel plants and collapsed building sites
    AA Adeleke, JK Odusote, PP Ikubanni, OA Lasode, OO Agboola, ...
    Data in brief 21, 1552-1557 , 2018
    2018
    Citations: 15
  • Resource assessment and feasibility study for the generation of hydrokinetic power in the tailwaters of selected hydropower stations in Nigeria
    LL Ladokun, BF Sule, KR Ajao, AG Adeogun
    Water Science 32 (2), 338-354 , 2018
    2018
    Citations: 45
  • Adaptation of Water Pump as a Micro Hydro-Turbine for Electricity Generation
    K Ajao, MO Agaja, H Ajimotokan, A Makar
    2018
    Citations: 1
  • Mechanical properties improvement evaluation of medium carbon steels quenched in different media
    PP Ikubanni, AA Adediran, AA Adeleke, KR Ajao, OO Agboola
    International Journal of Engineering Research in Africa 32, 1-10 , 2017
    2017
    Citations: 35
  • Design, Fabrication and Performance Evaluation of Awning/Canopy for Thermal Comfortability
    KR Ajao, T Yahaya, MY Kolawole, JO Aweda
    FUOYE Journal of Engineering and Technology , 2017
    2017
  • Electricity transmission losses in Nigeria power sector: a smart grid approach
    KR Ajao, AA Ogunmokun, F Nangolo, EO Adebo
    ATBU Journal of Science, Technology and Education 4 (3), 47-63 , 2017
    2017
    Citations: 10
  • Use of hand tools
    KR Ajao, AB Rabiu
    University of Ilorin Publishing House, University of Ilorin, Ilorin, Nigeria , 2017
    2017
  • Riverine Hydrokinetic Energy Potential in Selected Rivers In North Central, Nigeria
    LL Ladokun, AG Adeogun, KR Ajao, BF Sule
    Journal of Engineering Research 22 (1), 38-49 , 2017
    2017
  • Investigation of metallurgical and microhardness properties of Titanium alloy in laser metal deposition process
    RM Mahamood, S Abdulkareem, JO Aweda, KR Ajao
    UNILAG Journal of Medicine, Science and Technology 5 (2), 55-71 , 2017
    2017
  • Assessment of electro-mechanical components of bakolori small hydropower plant for refurbishment and modernization
    KR Ajao
    ATBU Journal of Science, Technology and Education , 2017
    2017
    Citations: 4

MOST CITED SCHOLAR PUBLICATIONS

  • Using HOMER power optimization software for cost benefit analysis of hybrid-solar power generation relative to utility cost in Nigeria
    KR Ajao, OA Oladosu, OT Popoola
    International Journal of Research and Reviews in Applied Sciences 7 (1), 96-102 , 2011
    2011
    Citations: 148
  • Electric energy supply in Nigeria, decentralized energy approach
    KR Ajao, HA Ajimotokan, OT Popoola, HF Akande
    Cogeneration and Distributed Generation Journal 24 (4), 34-50 , 2009
    2009
    Citations: 85
  • Resource assessment and feasibility study for the generation of hydrokinetic power in the tailwaters of selected hydropower stations in Nigeria
    LL Ladokun, BF Sule, KR Ajao, AG Adeogun
    Water Science 32 (2), 338-354 , 2018
    2018
    Citations: 45
  • Determination of the optimal tilt angle for solar photovoltaic panel in Ilorin, Nigeria
    KR Ajao, RM Ambali, MO Mahmoud
    Journal of Engineering Science and Technology Review 6 (1), 87-90 , 2013
    2013
    Citations: 39
  • Hydrokinetic energy conversion systems: Prospects and challenges in Nigerian hydrological setting
    LL Ladokun, KR Ajao, BF Sule
    Nigerian Journal of Technology 32 (3), 538-549 , 2013
    2013
    Citations: 36
  • Mechanical properties improvement evaluation of medium carbon steels quenched in different media
    PP Ikubanni, AA Adediran, AA Adeleke, KR Ajao, OO Agboola
    International Journal of Engineering Research in Africa 32, 1-10 , 2017
    2017
    Citations: 35
  • Comparison of Theoretical and Experimental Power output of Small 3-bladed Horizontal-axis Wind Turbine
    KR Ajao, JSO Adeniyi
    Journal of American Science 5 (4), 79-90 , 2009
    2009
    Citations: 33
  • Performance evaluation of a locally fabricated mini cassava flash dryer
    KR Ajao, IK Adegun
    Journal of Agricultural Technology 5 (2), 281-289 , 2009
    2009
    Citations: 31
  • Development and power performance test of a small three-blade horizontal-axis wind turbine
    KR Ajao, IK Adegun
    Heat Transfer Research 40 (8) , 2009
    2009
    Citations: 28
  • Wind energy conversion system: The past, the present and the prospect
    KR Ajao, MR Mahamood
    Journal of American Science 5 (6), 17-22 , 2009
    2009
    Citations: 26
  • Design and development of a groundnut oil expelling machine.
    KR Ajao, HA Ajimotokan, J Olaomi, HF Akande
    2010
    Citations: 23
  • Assessing the Drying rates of some Crops in Solar Dryer
    KR Ajao, AA Adedeji
    Journal of Research Information in Civil Engineering 5 (1), 1-12 , 2008
    2008
    Citations: 20
  • Cost-benefit analysis of hybrid wind-solar power generation by homer power optimization software
    KR Ajao, OA Oladosu, OT Popoola
    Journal of Applied Science and Technology 16 (1-2) , 2011
    2011
    Citations: 17
  • Evaluation of noise pollution and effects on workers during wheat processing
    IB Ibrahim, AS Aremu, KR Ajao, AT Ojelabi
    Journal of Applied Sciences and Environmental Management 18 (4), 599-601 , 2014
    2014
    Citations: 16
  • Compact fluorescent lamps and electricity consumption trend in residential buildings in Ilorin, Nigeria
    BF Sule, KR Ajao, HA Ajimotokan, MK Garba
    International Journal of Energy Sector Management 5 (2), 162-168 , 2011
    2011
    Citations: 16
  • Dataset on the evaluation of chemical and mechanical properties of steel rods from local steel plants and collapsed building sites
    AA Adeleke, JK Odusote, PP Ikubanni, OA Lasode, OO Agboola, ...
    Data in brief 21, 1552-1557 , 2018
    2018
    Citations: 15
  • Development of equipment for making homemade laundry soap
    KR Ajao, OJ Ogunniyi, KL Ahmed
    Journal of Agricultural Technology 7 (3), 567-574 , 2011
    2011
    Citations: 11
  • Engineering education and sustainable development in Nigeria
    HA Ajimotokan, KR Ajao, KA Adebiyi, A Dainkeh, AA Oloyede
    Department of Civil Engineering, University of Ilorin , 2019
    2019
    Citations: 10
  • Electricity transmission losses in Nigeria power sector: a smart grid approach
    KR Ajao, AA Ogunmokun, F Nangolo, EO Adebo
    ATBU Journal of Science, Technology and Education 4 (3), 47-63 , 2017
    2017
    Citations: 10
  • Design and fabrication of a home scale pedal-powered cassava grater
    KR Ajao, SO Ayilara, IO Usman
    Annals of the Faculty of Engineering Hunedoara 11 (3), 61 , 2013
    2013
    Citations: 9