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In a spatially flat Friedmann-Lema\^{i}tre-Robertson-Walker universe, weinvestigate a unified cosmic fluid scenario endowed with bulk viscosity inwhich the coefficient of the bulk viscosity has a power law evolution. Thepower law in the bulk viscous coefficient is a general case in this study whichnaturally includes several choices as special cases. Considering such a generalbulk viscous scenario, in the present work we have extracted the observationalconstraints using the latest cosmological datasets and examine their behaviourat the level of both background and perturbations. From the observationalanalyses, we find that a non-zero bulk viscous coefficient is always favoredand some of the models in this series are able to weaken the current tension on$H_0$ for some dataset. However, from the Bayesian evidence analysis,$\Lambda$CDM is favored over the bulk viscous model.

Challenging bulk viscous unified scenarios with cosmological observations