Aswatha obtained his bachelor’s degree in
Mechanical Engineering from Bangalore
University, Bangalore in 1997. His
Masters and Ph.D. were obtained from
Visvevaraya Technological University,
Belgaum. He is presently working as
Professor in the Department of
Mechanical Engineering at Bangalore Institute of
Technology, Bangalore. His areas of interest are fluid flow,
natural convection heat and mass transfer in enclosures,
thermal management in data centers and electronic systems,
and computational fluid dynamics. He has about 30 international
journal publications.
I have 25 years of teaching experience. Guided 10 PhD Students.
LIC Member - VTU 2022 - 2023
Member Board of Examination (BOE) BU 2021 - 22 (ODD & EVEN)
GT&TC R&D Advisory Board Member Since 2020
Achievement: Top Downloaded Article Wiley 1 Jan 2021 - 31 Dec 2021
EDUCATION
BE, M Tech, PhD.
RESEARCH, TEACHING, or OTHER INTERESTS
Engineering, Mechanical Engineering, Computational Mechanics, Mechanics of Materials
Enhanced effectiveness with positive Joule–Thomson pressure drop effects on a cryogenic heat exchanger with three fluid-two communications Vishnudas Alias Vipul Luvu Chodankar, Aswatha Aswatha, K.N. Seetharamu International Journal of Numerical Methods for Heat and Fluid Flow, 2022 Purpose The purpose of this paper is to attain higher effectiveness with an introduction of Joule–Thomson effect on a three-fluid heat exchanger with two communications. It also gives a range of parameter values that have to be maintained for achieving effectiveness above 0.85. Attaining effectiveness above 0.85 is very important for the heat exchanger to perform the liquefaction of hot fluid. Design/methodology/approach The analysis is conducted using Galerkin’s method, a finite element approach. Findings This investigation determines crucial values for the cryogenic heat exchanger to achieve effectiveness above 0.85. The important findings are as follows: effectiveness above 0.85 is attained if the heat exchanger size is within the range of 8–10; ratio of heat flow resistance between intermediate and hot stream to heat flow resistance between cold and hot stream should be maintained between 1 and 10; the intermediate fluid temperature should be maintained between 0 and 0.2; the ratio of thermal capacity of the hot fluid relative to a cold fluid should be maintained between 1.25 and 1.42; and the ratio of thermal capacity of the hot fluid relative to an intermediate fluid should be maintained between 2 and 2.5. Research limitations/implications The investigation has presented a finding for improving the effectiveness of the cryogenic heat exchanger. Higher the Joule–Thomson pressure drop effect, more is the drop in temperature of the fluid resulting in additional cooling or lowering of the fluid temperature. The practical implementation is also explained, i.e. to achieve practically the Joule–Thomson pressure drop in a cryogenic heat exchanger. Originality/value To the best of the authors’ knowledge, no investigations were carried out previously on Joule–Thomson investigation on a three-fluid heat exchanger with two communications, for different values of Joule–Thomson pressure drop.
Joule–Thomson effect investigations on a cryogenic three-fluid–three thermal communication heat exchanger Vishnudas Alias Vipul L. Chodankar, Aswatha, V. Krishna, K. N. Seetharamu Heat Transfer, 2022 The present study investigates the Joule–Thomson (JT) effect due to pressure drop on three‐fluid heat exchangers (HXs) with three thermal communications. The increased miniaturization of cryogenic HXs has led to the introduction of the JT effect. The present study investigates JT effects on a three‐fluid HX with three communications presenting different JT effects, which leads to a rise or drop in effectiveness values. The study is carried out using finite element analysis and MATLAB, considering seven nondimensional parameters of which one is JT pressure drop. The highest effectiveness is achieved for the positive JT effect at the hot stream. This improved effectiveness at hot fluid is achieved by maintaining the size (number of transfer units) of the HX more than 3.1, along with the ratio of the cold fluid heat capacity to the hot fluid heat capacity above 0.8 and the intermediate fluid temperature above 0.7.
The role of a partition on free convection in a trapezoidal shaped building R. Nagaraja, Aswatha, K. N. Seetharamu Heat Transfer, 2020 Heat transfer and fluid flow in a partitioned trapezoidal‐shaped building are carried out. The finite‐volume computational procedure is adopted for numerical simulations. The inclined wall of the building is uniformly heated; the vertical wall is the cold wall, whereas the top and bottom walls are adiabatic. The ranges of parameters studied are the Rayleigh number, Ra (103 ≤ Ra ≤ 106), the location of the partition, d (0.3L ≤ d ≤ 0.9L), and the partition height, h (0.3H ≤ h ≤ 0.9H). The results are presented for different locations and height of the partition in an enclosure in terms of temperature patterns, streamline curves, and the local and overall Nusselt numbers. It is noticed that when the height of the partition increases beyond 0.3H irrespective of the position of the partition, the heat transfer decreases drastically for all Rayleigh numbers. The comfort zones are located in the cavity for different partition heights. Correlations are developed for Nusselt numbers in terms of the Rayleigh number and height of the partition.
Numerical investigations of conjugate natural convection in a square cavity filled with nanofluid with temperature variations onhorizontal walls International Conference on Computational Methods for Thermal Problems, 2018
Effect of joule-thomson pressure drop on the thermal performance of a three fluid heat exchanger with three communications, for cryogenic applications using finite element method International Conference on Computational Methods for Thermal Problems, 2018
Effect of convective boundary conditions at bottom wall on natural convections in a square cavity Journal of Engineering Science and Technology, 2013
Effect of different thermal boundary conditions at bottom wall on natural convection in cavities Journal of Engineering Science and Technology, 2011
RECENT SCHOLAR PUBLICATIONS
Power law coefficient effects on buoyant heat transfer in porous trapezoidal enclosures VM Vijaya Kumara, Aswatha, R Vasanth Kumar, CB Hemanth Kumar, ... Interactions 247 (1), 4 , 2026 2026
Energy absorption and damage prediction in natural fibre composites under low velocity impact using machine learning and FEA SKSIAFE N. Rekha, Aswatha Munipapanna, N. Santhosh, Channa Keshava Naik N ... Scientific reports, https://doi.org/10.1038/s41598-025-24403 , 2025 2025 Citations: 2
Wear Behavior of AA2219‑B4C Composite Fabricated via Stir Casting Followed by Age Hardening BSAMBTSSPALT Jagadeesha J. Inst. Eng. India Ser. D , 2024 2024 Citations: 6
Studies on the Buoyancy Effect in Right-Angled Trapezoidal Cavities VM Vijaya Kumara, Aswatha, S Tejas ISME International Conference on Advances in Mechanical Engineering, 135-141 , 2023 2023
Effect of aspect ratio on the onset of natural convection in porous trapezoidal enclosures BSS V.M. Vijaya Kumara, Aswatha, K.S. Pavan, A.S. Sagar Reddy, R.V. Sai charan Materials today 92, 314-321 , 2023 2023
Enhanced effectiveness with positive Joule–Thomson pressure drop effects on a cryogenic heat exchanger with three fluid-two communications VAVL Chodankar, KN Seetharamu International Journal of Numerical Methods for Heat & Fluid Flow 32 (5 … , 2022 2022 Citations: 1
Improved effectiveness of a cryogenic counter-current parallel flow-Three fluid heat exchanger with three thermal communication due to Joule Thomson pressure drop VAVL Chodankar, KN Seetharamu International Journal of Thermal Sciences 172, 107267 , 2022 2022 Citations: 7
Improved effectiveness of a cryogenic counter-current parallel flow - Three fluid heat exchanger with three thermal communication due to Joule Thomson pressure drop KNS Vishnudas Alias Vipul L. Chodankar , Aswatha International Journal of Thermal Sciences , 2022 2022
Joule–Thomson effect investigations on a cryogenic three‐fluid–three thermal communication heat exchanger VAVL Chodankar, Aswatha, V Krishna, KN Seetharamu Heat Transfer 51 (1), 866-890 , 2022 2022 Citations: 1
Structural Analysis of Non-pneumatic Tires with Hexagonal Spokes AM Kiran M., R. S. Charan, B. M. Sakshi, Akul Nikhil, Babu Rao Ponangi SAE International Journal , 2021 2021
Effect of heat treatment on fatigue characteristics of EN8 Steel M Ravindran, M Aswatha, N Santhosh, G Ravichandran, M Madhusudhan IOP Conference Series: Materials Science and Engineering 1013 (1), 012009 , 2021 2021 Citations: 15
The role of a partition on free convection in a trapezoidal shaped building R Nagaraja, Aswatha, KN Seetharamu Heat Transfer 49 (7), 4056-4072 , 2020 2020
Buoyant Energy Transmission within a Porous Square and Non-Square Cavity VKV MANCHAIAH International Journal of Science, Technology, Engineering and Management-A … , 2020 2020
Buoyant Heat Transfer in a Porous Cavity of Trapezoidal Shape VKV MANCHAIAH International Journal of Science, Technology, Engineering and Management-A … , 2020 2020
Numerical studies on natural convection in a trapezoidal enclosure with discrete heating KGBM Gowda, MS Rajagopal, KN Seethramu Heat Transfer Engineering , 2020 2020 Citations: 19
Effect of Joule-Thomson pressure drop on a cryogenic three fluid heat exchanger with two communications VAVL Chodankar, V Krishna, KN Seetharamu Cryogenics 106, 103046 , 2020 2020 Citations: 5
Natural Convection in a Square Enclosure with Partitions KNS R. Nagaraja, Aswatha, Vijay Kumar V. M Studies in Indian Place Names (UGC Care Journals) 40 (71) , 2020 2020
Heat transfer in a side heated trapezoidal cavity with openings BMK Gowda, MS Rajagopal, KN Seetharamu Engineering Science and Technology, an International Journal 22 (1), 153-167 , 2019 2019 Citations: 18
EFFECT OF CONJUGATE NATURAL CONVECTION FLOW IN A SQUARE ENCLOSURE WITH ALL SIDE WALL B Babali, KN Seetharamu Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and … , 2017 2017
Computational analysis and design for precision forging of aluminium AA 6061 connector N Santhosh, N Vinayaka, MU Aswatha, BA Praveena International Journal of Computational Engineering Research 3 (9), 1-8 , 2013 2013 Citations: 10
MOST CITED SCHOLAR PUBLICATIONS
Effect of different thermal boundary conditions at bottom wall on natural convection in cavities K Seetharamu Journal of Engineering Science and Technology 6 (1), 109-130 , 2011 2011 Citations: 22
Numerical studies on natural convection in a trapezoidal enclosure with discrete heating KGBM Gowda, MS Rajagopal, KN Seethramu Heat Transfer Engineering , 2020 2020 Citations: 19
Heat transfer in a side heated trapezoidal cavity with openings BMK Gowda, MS Rajagopal, KN Seetharamu Engineering Science and Technology, an International Journal 22 (1), 153-167 , 2019 2019 Citations: 18
Buoyancy driven heat transfer in cavities subjected to thermal boundary conditions at bottom wall CJ Gangadhara Gowda, SN Sridhara, KN Seetharamu Journal of Applied Fluid Mechanics 5 (2), 43-53 , 2012 2012 Citations: 17
Effect of heat treatment on fatigue characteristics of EN8 Steel M Ravindran, M Aswatha, N Santhosh, G Ravichandran, M Madhusudhan IOP Conference Series: Materials Science and Engineering 1013 (1), 012009 , 2021 2021 Citations: 15
Computational analysis and design for precision forging of aluminium AA 6061 connector N Santhosh, N Vinayaka, MU Aswatha, BA Praveena International Journal of Computational Engineering Research 3 (9), 1-8 , 2013 2013 Citations: 10
Improved effectiveness of a cryogenic counter-current parallel flow-Three fluid heat exchanger with three thermal communication due to Joule Thomson pressure drop VAVL Chodankar, KN Seetharamu International Journal of Thermal Sciences 172, 107267 , 2022 2022 Citations: 7
Wear Behavior of AA2219‑B4C Composite Fabricated via Stir Casting Followed by Age Hardening BSAMBTSSPALT Jagadeesha J. Inst. Eng. India Ser. D , 2024 2024 Citations: 6
Effect of Joule-Thomson pressure drop on a cryogenic three fluid heat exchanger with two communications VAVL Chodankar, V Krishna, KN Seetharamu Cryogenics 106, 103046 , 2020 2020 Citations: 5
Energy absorption and damage prediction in natural fibre composites under low velocity impact using machine learning and FEA SKSIAFE N. Rekha, Aswatha Munipapanna, N. Santhosh, Channa Keshava Naik N ... Scientific reports, https://doi.org/10.1038/s41598-025-24403 , 2025 2025 Citations: 2
Enhanced effectiveness with positive Joule–Thomson pressure drop effects on a cryogenic heat exchanger with three fluid-two communications VAVL Chodankar, KN Seetharamu International Journal of Numerical Methods for Heat & Fluid Flow 32 (5 … , 2022 2022 Citations: 1
Joule–Thomson effect investigations on a cryogenic three‐fluid–three thermal communication heat exchanger VAVL Chodankar, Aswatha, V Krishna, KN Seetharamu Heat Transfer 51 (1), 866-890 , 2022 2022 Citations: 1
Power law coefficient effects on buoyant heat transfer in porous trapezoidal enclosures VM Vijaya Kumara, Aswatha, R Vasanth Kumar, CB Hemanth Kumar, ... Interactions 247 (1), 4 , 2026 2026
Studies on the Buoyancy Effect in Right-Angled Trapezoidal Cavities VM Vijaya Kumara, Aswatha, S Tejas ISME International Conference on Advances in Mechanical Engineering, 135-141 , 2023 2023
Effect of aspect ratio on the onset of natural convection in porous trapezoidal enclosures BSS V.M. Vijaya Kumara, Aswatha, K.S. Pavan, A.S. Sagar Reddy, R.V. Sai charan Materials today 92, 314-321 , 2023 2023
Improved effectiveness of a cryogenic counter-current parallel flow - Three fluid heat exchanger with three thermal communication due to Joule Thomson pressure drop KNS Vishnudas Alias Vipul L. Chodankar , Aswatha International Journal of Thermal Sciences , 2022 2022
Structural Analysis of Non-pneumatic Tires with Hexagonal Spokes AM Kiran M., R. S. Charan, B. M. Sakshi, Akul Nikhil, Babu Rao Ponangi SAE International Journal , 2021 2021
The role of a partition on free convection in a trapezoidal shaped building R Nagaraja, Aswatha, KN Seetharamu Heat Transfer 49 (7), 4056-4072 , 2020 2020
Buoyant Energy Transmission within a Porous Square and Non-Square Cavity VKV MANCHAIAH International Journal of Science, Technology, Engineering and Management-A … , 2020 2020
Buoyant Heat Transfer in a Porous Cavity of Trapezoidal Shape VKV MANCHAIAH International Journal of Science, Technology, Engineering and Management-A … , 2020 2020
