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The postcombustion CO 2 capture technology (PCC) is the topic of surplus study because it offers ease of implementation in the existing systems. To the best of the authors' knowledge, this technique has never been used for the automobile sector which has a major contribution toward anthropogenic CO 2 . In this article, experimental investigation has been carried out on the chemical solvents to determine the efficacy of capturing CO 2 from multi-pollutant diesel engine exhaust. The captured CO 2 is measured in terms of percentage by volume of the total exhaust gas from three primary amines solvents, that is, monoethanolamine (MEA), N,N-dimethylethanolamine (DMEA), and ammonia at seven brake power values, and their capture efficiencies are compared. A proposed design for the implementation of carbon capture unit in the existing heavy-duty diesel engine has also been presented with theoretical calculation on the weight of the storage tank. Energy balance analyses have been performed to determine the energy needed to regenerate the solvents. It is found that the regeneration energy required for solvents MEA, DMEA, and ammonia is 2.2, 0.7, and 1.1 kWh, respectively which is quite lower than the total energy available with exhaust gas. Experimental results show that capture efficiency at ambient conditions with absorbents MEA, DMEA, and chilled ammonia is 90.95, 57.66, and 80.08, respectively. It reveals that the PCC method can be implemented in an existing diesel engine with MEA as an efficient and safe solvent.

Purpose -The purpose of this paper is to develop a numerical model for estimating the unknown boundary heat flux in a parallel plate channel for the case of a hydrodynamically and thermally developing laminar flow. Design/methodology/approach -The conjugate gradient method (CGM) is used to solve the inverse problem. The momentum equations are solved using an in-house computational fluid dynamics (CFD) source code. The energy equations along with the adjoint and sensitivity equations are solved using the finite volume method.Findings -The effects of number of measurements, distribution of measurements and functional form of unknown flux on the accuracy of estimations are investigated in this work. The prediction of boundary flux by the present algorithm is found to be quite reasonable. Originality/value -It is noticed from the literature review that study of inverse problem with hydrodynamically developing flow has not received sufficient attention despite its practical importance. In the present work, a hydrodynamically and thermally developing flow between two parallel plates is considered and unknown transient boundary heat flux at the upper plate of a parallel plate channel is estimated using CGM.

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