Carbon nanotubes (CNTs) are inevitable due to its tremendously high thermal and electrical conductivities, strength, stiffness, and toughness characteristics. The utilization of both porous media and nanofluids with CNTs as nanoparticles can augment the thermal efficiency of typical physical systems significantly. In view of such advantages, the present study is intended to convey the influence of entropy minimization and nonlinear thermal radiation on the electromagnetic flow of nanofluids with single wall carbon nanotubes (SWCNTs) and multiwall carbon nanotubes (MWCNTs) nanoparticles suspensions past the surface of thin needle. In addition, the famous Darcy Forchheimer flow and Cattaneo-Christov heat flux models are implemented. The required numerical solution is devised pragmatically via bvp4c in MATLAB for the system of highly nonlinear ordinary differential equations. It is found that the porous matrix and local Forchheimer parameter are detrimental to the regular flow of nanofluids. Thermal fields magnify in respect of hiked porosity and temperature ratio parameters and diminish due to rise in electric and thermal relaxation parameters. Entropy minimization due to porous irreversibility is prominent for MWCNTs than SWCNTs. Bejan number upsurges due to rise in volume fraction and porosity parameter for both SWCNT-water and MWCNT-water nanofluids.

碳纳米管（CNT）由于其极高的导热性和导电性，强度，刚度和韧性特性而不可避免。多孔介质和具有纳米管的纳米流体作为纳米颗粒的利用可以显着提高典型物理系统的热效率。鉴于这些优点，本研究旨在传达熵最小化和非线性热辐射对单壁碳纳米管（SWCNTs）和多壁碳纳米管（MWCNTs）纳米颗粒悬浮液越过薄表面的纳米流体电磁流的影响。针。此外，还实现了著名的Darcy Forchheimer流动模型和Cattaneo-Christov热通量模型。通过MATLAB中的bvp4c务实地为高度非线性的常微分方程组设计了所需的数值解。发现多孔基质和局部的Forchheimer参数不利于纳米流体的规则流动。就提高的孔隙率和温度比参数而言，热场会放大，并由于电和热弛豫参数的增加而减小。由于多孔不可逆性，使熵最小化对于MWCNT比SWCNT更为突出。由于SWCNT-水和MWCNT-水纳米流体的体积分数和孔隙率参数增加，Bejan数激增。就提高的孔隙率和温度比参数而言，热场会放大，由于电和热弛豫参数的增加，热场会减小。由于多孔不可逆性，使熵最小化对于MWCNT比SWCNT更为突出。由于SWCNT-水和MWCNT-水纳米流体的体积分数和孔隙率参数增加，Bejan数激增。就提高的孔隙率和温度比参数而言，热场会放大，并由于电和热弛豫参数的增加而减小。由于多孔不可逆性，使熵最小化对于MWCNT比SWCNT更为突出。由于SWCNT-水和MWCNT-水纳米流体的体积分数和孔隙率参数增加，Bejan数激增。