International Journal of Heat and Technology Vol. 39, No. 3, June, 2021, pp. 841-850 Journal homepage: http://iieta.org/journals/ijht Influence of Heat Source/Sink on Free Convection in Annular Porous Region Anurag1, Shyam Lal Yadav2*, Ashok Kumar Singh1 1 Department of Mathematics, Institute of Science, Banaras Hindu University, Varanasi 221005, Uttar Pradesh, India 2 Department of Mathematics, Lok Nayak Jai Prakash Institute of Technology, Chhapra 841302, Bihar, India Corresponding Author Email:
[email protected] https://doi.org/10.18280/ijht.390318 ABSTRACT Received: 4 January 2020 The significant interpretation of this model is to explore the influence of temperature- Accepted: 26 December 2020 dependent heat source/sink on laminar free-convective flow in an annular porous region such as petroleum engineering, thermal technique and groundwater hydrology. For a Keywords: unified solution of the Brinkman-Darcy model, the regulatory equations solved analytically fully developed flow, natural convection, by applying the variation of parameter technique in terms of Bessel's functions for the heat source and sink, isothermal and constant heat source and sink. Moreover, we have investigated the Variations of Darcy number, Heat flux, modified Bessel function source/sink and viscosity ratio in the presence of isothermal and constant heat flux sequentially. As a result, we received the critical value of the velocity for the radii ratio (R = 2.05 and 2.92) in both the cases of source and sink (S = 1.0 and Si = 0.1) respectively which is exhibited through the graphs. Further, the numerical outcomes present of the skin friction including volume flow with annular gap by the graphs as well as tables.