World's Best Scientists 2026 revealed!

D-Index & Metrics

Mechanical and Aerospace Engineering

D-Index
42
Citations
8273
World Ranking
1801
National Ranking
686

Pega Hrnjak publication distribution in Mechanical and Aerospace Engineering in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Mechanical and Aerospace Engineering in 2026. The highlighted bar marks where Pega Hrnjak sits on this spectrum.

47–56 publications: 10 scientists 57–66 publications: 23 scientists 67–76 publications: 32 scientists 77–86 publications: 62 scientists 87–96 publications: 67 scientists 97–106 publications: 91 scientists 107–116 publications: 113 scientists 117–126 publications: 115 scientists 127–136 publications: 130 scientists 137–146 publications: 140 scientists 147–156 publications: 155 scientists 157–166 publications: 132 scientists 167–176 publications: 133 scientists 177–186 publications: 130 scientists 187–196 publications: 140 scientists 197–206 publications: 115 scientists 207–216 publications: 125 scientists 217–226 publications: 117 scientists 227–236 publications: 99 scientists 237–246 publications: 92 scientists 247–256 publications: 100 scientists 257–266 publications: 95 scientists 267–276 publications: 88 scientists 277–286 publications: 77 scientists 287–296 publications: 74 scientists 297–306 publications: 74 scientists 307–316 publications: 62 scientists 317–326 publications: 70 scientists 327–336 publications: 59 scientists 337–346 publications: 58 scientists 347–356 publications: 45 scientists 357–366 publications: 44 scientists 367–376 publications: 36 scientists 377–386 publications: 41 scientists 387–396 publications: 32 scientists 397–406 publications: 23 scientists 407–416 publications: 28 scientists 417–426 publications: 27 scientists 427–436 publications: 25 scientists 437–446 publications: 23 scientists 447–456 publications: 23 scientists 457–466 publications: 20 scientists 467–476 publications: 12 scientists 477–486 publications: 24 scientists 487–496 publications: 18 scientists 497–506 publications: 12 scientists 507–516 publications: 13 scientists 517–526 publications: 21 scientists 527–536 publications: 12 scientists 537–546 publications: 8 scientists 547–556 publications: 16 scientists 557–566 publications: 3 scientists 567–576 publications: 11 scientists 577–586 publications: 6 scientists 587–596 publications: 5 scientists 597–606 publications: 6 scientists 607–616 publications: 7 scientists 617–626 publications: 7 scientists 627–636 publications: 10 scientists 637–646 publications: 4 scientists 647–656 publications: 3 scientists 657–658 publications: 2 scientists 659+ publications: 100 scientists
47 publications 659+

This scientist: 519 publications — 94th percentile

94% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 659 publications or more.

Pega Hrnjak D-index placement in Mechanical and Aerospace Engineering in 2026

The chart shows the D-index (discipline H-index) distribution of Mechanical and Aerospace Engineering scientists ranked by Research.com in 2026. The highlighted bar marks where Pega Hrnjak sits on this spectrum.

30 D-Index: 83 scientists 31 D-Index: 113 scientists 32 D-Index: 144 scientists 33 D-Index: 153 scientists 34 D-Index: 189 scientists 35 D-Index: 158 scientists 36 D-Index: 139 scientists 37 D-Index: 127 scientists 38 D-Index: 130 scientists 39 D-Index: 126 scientists 40 D-Index: 104 scientists 41 D-Index: 100 scientists 42 D-Index: 107 scientists 43 D-Index: 101 scientists 44 D-Index: 103 scientists 45 D-Index: 79 scientists 46 D-Index: 88 scientists 47 D-Index: 70 scientists 48 D-Index: 83 scientists 49 D-Index: 44 scientists 50 D-Index: 64 scientists 51 D-Index: 56 scientists 52 D-Index: 50 scientists 53 D-Index: 48 scientists 54 D-Index: 58 scientists 55 D-Index: 52 scientists 56 D-Index: 48 scientists 57 D-Index: 42 scientists 58 D-Index: 34 scientists 59 D-Index: 42 scientists 60 D-Index: 37 scientists 61 D-Index: 42 scientists 62 D-Index: 44 scientists 63 D-Index: 22 scientists 64 D-Index: 33 scientists 65 D-Index: 29 scientists 66 D-Index: 23 scientists 67 D-Index: 29 scientists 68 D-Index: 24 scientists 69 D-Index: 19 scientists 70 D-Index: 34 scientists 71 D-Index: 26 scientists 72 D-Index: 19 scientists 73 D-Index: 18 scientists 74 D-Index: 19 scientists 75 D-Index: 14 scientists 76 D-Index: 19 scientists 77 D-Index: 8 scientists 78 D-Index: 18 scientists 79 D-Index: 16 scientists 80 D-Index: 12 scientists 81 D-Index: 17 scientists 82 D-Index: 11 scientists 83 D-Index: 16 scientists 84 D-Index: 7 scientists 85 D-Index: 9 scientists 86 D-Index: 8 scientists 87 D-Index: 6 scientists 88 D-Index: 6 scientists 89 D-Index: 7 scientists 90 D-Index: 10 scientists 91 D-Index: 4 scientists 92 D-Index: 4 scientists 93+ D-Index: 100 scientists
30 D-Index 93+

This scientist: 42 D-Index — 49th percentile

49% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 93 D-Index or more.

Best Publications

  • Experimental validation of a prototype ejector designed to reduce throttling losses encountered in transcritical R744 system operation

    Stefan Elbel;Pega Hrnjak

  • Frost, defrost, and refrost and its impact on the air-side thermal-hydraulic performance of louvered-fin, flat-tube heat exchangers

    Y. Xia;Y. Zhong;P.S. Hrnjak;A.M. Jacobi

  • R-744 gas cooler model development and validation

    Jian Min Yin;Clark W. Bullard;Predrag S. Hrnjak

  • CO2 and R410A flow boiling heat transfer, pressure drop, and flow pattern at low temperatures in a horizontal smooth tube

    C.Y. Park;P.S. Hrnjak

  • Experimental and numerical study on microchannel and round-tube condensers in a R410A residential air-conditioning system

    Chang Yong Park;Pega Hrnjak

  • Single phase pressure drop in microchannels

    Predrag Stojan Hrnjak;Xiao Tu

  • Flash gas bypass for improving the performance of transcritical R744 systems that use microchannel evaporators

    Stefan Elbel;Predrag Stojan Hrnjak

  • Contribution of Internal Heat Exchanger to Transcritical R-744 Cycle Performance

    D. E. Boewe;C. W. Bullard;J. M. Yin;P. S. Hrnjak

  • Microchannel heat exchangers for charge minimization in air-cooled ammonia condensers and chillers

    Pega Hrnjak;Andy D. Litch

  • Flash gas bypass in mobile air conditioning system with R134a

    Hanfei Tuo;Predrag Stojan Hrnjak

  • Experimental results of transcritical CO2 heat pump for residential application

    M. R. Richter;S. M. Song;J. M. Yin;M. H. Kim

  • Experimental investigation on two-phase flow boiling heat transfer of five refrigerants in horizontal small tubes of 0.5, 1.5 and 3.0 mm inner diameters

    Jong Taek Oh;Agus Sunjarianto Pamitran;Kwang Il Choi;Pega Hrnjak

  • CO2 flow condensation heat transfer and pressure drop in multi-port microchannels at low temperatures

    Chang Yong Park;Predrag Stojan Hrnjak

  • Effect of the header pressure drop induced flow maldistribution on the microchannel evaporator performance

    Hanfei Tuo;Predrag Stojan Hrnjak;Predrag Stojan Hrnjak

  • Effect of the condenser subcooling on the performance of vapor compression systems

    Gustavo Pottker;Predrag Stojan Hrnjak

  • Characteristics of two-phase flow pattern transitions and pressure drop of five refrigerants in horizontal circular small tubes

    Agus Sunjarianto Pamitran;Kwang Il Choi;Jong Taek Oh;Pega Hrnjak

  • Experiment and visualization on R134a upward flow in the vertical header of microchannel heat exchanger and its effect on distribution

    Yang Zou;Predrag Stojan Hrnjak;Predrag Stojan Hrnjak

  • Experimental investigation of the effect of condenser subcooling in R134a and R1234yf air-conditioning systems with and without internal heat exchanger

    Gustavo Pottker;Pega Hrnjak

  • Air-side performance evaluation of three types of heat exchangers in dry, wet and periodic frosting conditions

    Ping Zhang;Ping Zhang;Predrag Stojan Hrnjak

  • Ejector Refrigeration: An Overview of Historical and Present Developments with an Emphasis on Air-Conditioning Applications

    Stefan Elbel;Predrag Hrnjak

Frequent Co-Authors

Anthony M. Jacobi
Anthony M. Jacobi University of Illinois at Urbana-Champaign
Andrew G. Alleyne
Andrew G. Alleyne University of Minnesota
Mark A. Shannon
Mark A. Shannon University of Illinois at Urbana-Champaign

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